Landau, J.,
The principal issue in this appeal is whether the state of Connecticut has acquired criminal jurisdiction over the Mashantucket Pequot Indian reservation in Ledyard. The defendant, Lake Spears, was charged by a substitute information1 with committing various crimes while on the Mashantucket Pequot reservation. The defendant moved to dismiss the charges, claiming that the court lacked subject matter jurisdiction because the charged offenses were allegedly committed on the Mashantucket Pequot reservation.2 The [108]*108trial court denied that motion, and rendered a judgment of conviction following the defendant’s plea of nolo contendere to the charges of interfering with a peace officer in violation of General Statutes § 53a-167a, assault in the third degree in violation of General Statutes § 53a-61, and disorderly conduct in violation of General Statutes § 53a-182. The defendant’s plea was entered conditional on his right to appeal the denial of his motion to dismiss.3
The following facts are not in dispute. The Mashantucket Pequot Indian tribe is a federally recognized tribe that owns and occupies a tribal reservation containing approximately 1800 acres in Ledyard. The defendant is a member of the Narragansett Indian tribe, and not a member of the Mashantucket Pequot tribe.4 On November 29, 1991, in response to a telephone call, State Trooper Robert Maynard was dispatched to investigate a disturbance at 8 Elizabeth George Drive, a residential address on the Mashantucket Pequot reservation. Maynard was assisted by Ledyard town constables Sergeant David Guiher and Officers John Craig and William Blanchette. As a result of actions by the defendant, he was arrested by Maynard and Craig, charged, and ultimately presented before the Superior Court. At the time of the defendant’s arrest and presentment, he was “an Indian in [109]*109Indian territory.” After the trial court found the defendant guilty on the plea of nolo contendere, the defendant appealed.5
The defendant claims that the trial court improperly concluded that the Connecticut Indian Land Claims Settlement Act of 19836 (Settlement Act) effected a complete grant of criminal jurisdiction over the Mashantucket Pequot reservation to the state in that it (1) found that the plain meaning of § 6 of the Settlement Act, 25 U.S.C. § 1755,7 fully subjects the reservation to state criminal jurisdiction, and (2) found that the Mashantucket Pequot tribe has consented to state criminal jurisdiction.
The state asserts that it possesses criminal jurisdiction over the Mashantucket Pequot reservation pursuant to an express grant by Congress in § 6 of the Settlement Act. The state does not claim that the tribe is divested of self-government, or that the tribe cannot [110]*110enact tribal laws that govern the conduct of tribal members, or that the tribe lacks power to enforce such laws.8
The parties in this matter are in the curious position of agreeing on the issue, the general principles of law, the relevant authorities and the primary facts. Where the parties differ is on the result that is rendered after the facts are applied to the law.
The defendant claims that the state lacks jurisdiction over criminal offenses committed by Indians while on the Mashantucket Pequot reservation. The state and the defendant agree that states do not have jurisdiction over Indian country unless Congress has specifically authorized such jurisdiction. Worcester v. Georgia, 31 U.S. 515, 8 L. Ed. 483 (1832). They disagree, however, in regard to the application of § 6 of the Settlement Act. Specifically, they disagree on the issue of [111]*111whether § 6 vests the state with jurisdiction over crimes committed by Indians on the Mashantucket Pequot tribe’s reservation.
We agree with the defendant, and we arrive at our conclusion by way of the following statutory path. Section 6 of the Settlement Act, codified at 25 U.S.C. § 1755, addresses the issue of the state’s jurisdiction over the Mashantucket Pequot tribe. This statute refers to portions of Title IY of the Indian Civil Rights Act of 1968, codified at 25 U.S.C. §§ 1321 through 1326. The dispute in the present case concerns the impact of 25 U.S.C. § 1755 on §§ 401 and 406 of the Indian Civil Rights Act of 1968, codified at 25 U.S.C. §§ 1321 (a) and 1326, respectively. Specifically, the issue before us is whether 25 U.S.C. § 1755 vests the state with criminal jurisdiction over the Mashantucket Pequot tribe notwithstanding the provision contained in 25 U.S.C. § 1321 (a), which otherwise requires that a tribe manifest its consent to jurisdiction prior to a state’s assumption of jurisdiction.
We begin our analysis by examining the well established principles that govern state jurisdiction over Indians in Indian country.9 “Criminal jurisdiction over offenses committed in ‘Indian country’ ... is governed by a complex patchwork of federal,10 state, [112]*112and tribal law.”11 (Citation omitted; internal quotation marks omitted.) Negonsott v. Samuels, 507 U.S. 99, 102, 113 S. Ct. 1119, 122 L. Ed. 2d 457 (1993). “As a practical matter, this has meant that criminal offenses by or against Indians have been subject only to federal or tribal laws . . . except where Congress in the exercise of its plenary and exclusive power over Indian affairs has ‘expressly provided that State laws shall apply.’ ” (Citation omitted.) Washington v. Yakima Indian Nation, 439 U.S. 463, 470-71, 99 S. Ct. 740, 58 L. Ed. 2d 740 (1979). “When on-reservation conduct involving only Indians is at issue, state law is generally inapplicable, for the state’s regulatory interest is likely to be minimal and the federal interest in encouraging tribal self-government is at its strongest.” White Mountain Apache Tribe v. Bracken, 448 U.S. 136, 144, 100 S. Ct. 2578, 65 L. Ed. 2d 655 (1980).
In 1953, pursuant to its plenary authority over Indian affairs, Congress enacted Public Law 83-280,12 the first [113]*113federal jurisdictional statute of general applicability to Indian reservation lands; Bryan v. Itasca County,
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Landau, J.,
The principal issue in this appeal is whether the state of Connecticut has acquired criminal jurisdiction over the Mashantucket Pequot Indian reservation in Ledyard. The defendant, Lake Spears, was charged by a substitute information1 with committing various crimes while on the Mashantucket Pequot reservation. The defendant moved to dismiss the charges, claiming that the court lacked subject matter jurisdiction because the charged offenses were allegedly committed on the Mashantucket Pequot reservation.2 The [108]*108trial court denied that motion, and rendered a judgment of conviction following the defendant’s plea of nolo contendere to the charges of interfering with a peace officer in violation of General Statutes § 53a-167a, assault in the third degree in violation of General Statutes § 53a-61, and disorderly conduct in violation of General Statutes § 53a-182. The defendant’s plea was entered conditional on his right to appeal the denial of his motion to dismiss.3
The following facts are not in dispute. The Mashantucket Pequot Indian tribe is a federally recognized tribe that owns and occupies a tribal reservation containing approximately 1800 acres in Ledyard. The defendant is a member of the Narragansett Indian tribe, and not a member of the Mashantucket Pequot tribe.4 On November 29, 1991, in response to a telephone call, State Trooper Robert Maynard was dispatched to investigate a disturbance at 8 Elizabeth George Drive, a residential address on the Mashantucket Pequot reservation. Maynard was assisted by Ledyard town constables Sergeant David Guiher and Officers John Craig and William Blanchette. As a result of actions by the defendant, he was arrested by Maynard and Craig, charged, and ultimately presented before the Superior Court. At the time of the defendant’s arrest and presentment, he was “an Indian in [109]*109Indian territory.” After the trial court found the defendant guilty on the plea of nolo contendere, the defendant appealed.5
The defendant claims that the trial court improperly concluded that the Connecticut Indian Land Claims Settlement Act of 19836 (Settlement Act) effected a complete grant of criminal jurisdiction over the Mashantucket Pequot reservation to the state in that it (1) found that the plain meaning of § 6 of the Settlement Act, 25 U.S.C. § 1755,7 fully subjects the reservation to state criminal jurisdiction, and (2) found that the Mashantucket Pequot tribe has consented to state criminal jurisdiction.
The state asserts that it possesses criminal jurisdiction over the Mashantucket Pequot reservation pursuant to an express grant by Congress in § 6 of the Settlement Act. The state does not claim that the tribe is divested of self-government, or that the tribe cannot [110]*110enact tribal laws that govern the conduct of tribal members, or that the tribe lacks power to enforce such laws.8
The parties in this matter are in the curious position of agreeing on the issue, the general principles of law, the relevant authorities and the primary facts. Where the parties differ is on the result that is rendered after the facts are applied to the law.
The defendant claims that the state lacks jurisdiction over criminal offenses committed by Indians while on the Mashantucket Pequot reservation. The state and the defendant agree that states do not have jurisdiction over Indian country unless Congress has specifically authorized such jurisdiction. Worcester v. Georgia, 31 U.S. 515, 8 L. Ed. 483 (1832). They disagree, however, in regard to the application of § 6 of the Settlement Act. Specifically, they disagree on the issue of [111]*111whether § 6 vests the state with jurisdiction over crimes committed by Indians on the Mashantucket Pequot tribe’s reservation.
We agree with the defendant, and we arrive at our conclusion by way of the following statutory path. Section 6 of the Settlement Act, codified at 25 U.S.C. § 1755, addresses the issue of the state’s jurisdiction over the Mashantucket Pequot tribe. This statute refers to portions of Title IY of the Indian Civil Rights Act of 1968, codified at 25 U.S.C. §§ 1321 through 1326. The dispute in the present case concerns the impact of 25 U.S.C. § 1755 on §§ 401 and 406 of the Indian Civil Rights Act of 1968, codified at 25 U.S.C. §§ 1321 (a) and 1326, respectively. Specifically, the issue before us is whether 25 U.S.C. § 1755 vests the state with criminal jurisdiction over the Mashantucket Pequot tribe notwithstanding the provision contained in 25 U.S.C. § 1321 (a), which otherwise requires that a tribe manifest its consent to jurisdiction prior to a state’s assumption of jurisdiction.
We begin our analysis by examining the well established principles that govern state jurisdiction over Indians in Indian country.9 “Criminal jurisdiction over offenses committed in ‘Indian country’ ... is governed by a complex patchwork of federal,10 state, [112]*112and tribal law.”11 (Citation omitted; internal quotation marks omitted.) Negonsott v. Samuels, 507 U.S. 99, 102, 113 S. Ct. 1119, 122 L. Ed. 2d 457 (1993). “As a practical matter, this has meant that criminal offenses by or against Indians have been subject only to federal or tribal laws . . . except where Congress in the exercise of its plenary and exclusive power over Indian affairs has ‘expressly provided that State laws shall apply.’ ” (Citation omitted.) Washington v. Yakima Indian Nation, 439 U.S. 463, 470-71, 99 S. Ct. 740, 58 L. Ed. 2d 740 (1979). “When on-reservation conduct involving only Indians is at issue, state law is generally inapplicable, for the state’s regulatory interest is likely to be minimal and the federal interest in encouraging tribal self-government is at its strongest.” White Mountain Apache Tribe v. Bracken, 448 U.S. 136, 144, 100 S. Ct. 2578, 65 L. Ed. 2d 655 (1980).
In 1953, pursuant to its plenary authority over Indian affairs, Congress enacted Public Law 83-280,12 the first [113]*113federal jurisdictional statute of general applicability to Indian reservation lands; Bryan v. Itasca County, 426 U.S. 373, 379, 96 S. Ct. 2102, 48 L. Ed. 2d 710 (1976), and “the primary expression of federal policy governing the assumption by States of civil and criminal jurisdiction over the Indian Nations.” Three Affiliated Tribes of the Fort Berthold Reservation v. Wold Engineering, 476 U.S. 877, 884, 106 S. Ct. 2305, 90 L. Ed. 2d 881 (1986) (Three Tribes II). The primary purpose of that legislation was to address the “problem of lawlessness on certain Indian reservations, and the absence of adequate tribal institutions for law enforcement.” Id.; Washington v. Yakima Indian Nation, supra, 439 U.S. 471; H.R. Rep. No. 848, 83d Cong., 1st Sess., pp. 5-6 (1953). Other purposes of the act were “to [promote] the gradual assimilation of Indians into the dominant American culture and [ease] the fiscal and administrative burden borne by the Federal Government by virtue of its control over Indian affairs.” Three Tribes II, supra, 886; Bryan v. Itasca County, supra, 387-88; H.R. Rep. No. 848, supra, pp. 3, 6.
Public Law 83-280, § 2,13 embodied the provision for state criminal jurisdiction over offenses committed by or against Indians on reservations. Bryan v. Itasca County, supra, 426 U.S. 380. It effected an immediate grant of criminal jurisdiction over Indian country to five states.14 [114]*114To the remaining states, it provided an option to assume jurisdiction over criminal offenses in Indian country “without consulting with or securing the consent of the tribes that would be affected.” Washington v. Yakima Indian Nation, supra, 439 U.S. 473-74. Section 7 of Public Law 83-280 established a procedure by which all other states could obtain civil or criminal jurisdiction over Indian tribes: “The consent of the United States is hereby given to any other State not having jurisdiction with respect to criminal offenses or civil causes of action, or with respect to both, as provided for in this Act, to assume jurisdiction at such time and in such manner as the people of the State shall, by affirmative legislative action, obligate and bind the State to assumption thereof.” See Washington v. Yakima Indian Nation, supra, 474 n.9; Schaghticoke Indians of Kent, Connecticut, Inc. v. Potter, 217 Conn. 612, 622, 587 A.2d 139 (1991).
In 1968, Congress enacted Title IV of the Indian Civil Rights Act,15 which repealed § 7 of Public Law 83-280. Title IV requires that all subsequent assertions of jurisdiction be preceded by tribal consent. Three Affiliated Tribes of the Fort Berthold Reservation v. Wold Engineering, 467 U.S. 138, 144, 104 S. Ct. 2267, 81 L. Ed. 2d 113 (1984) (Three Tribes I). “The impetus for the addition of a consent requirement in the 1968 amendments was congressional dissatisfaction with the involuntary extension of state jurisdiction over Indians who did not feel they were ready to accept such jurisdiction, or who felt threatened by it.” Three Tribes II, supra, 476 U.S. 892, citing S. Rep. No. 721, 90th Cong., 1st Sess., p. 32 (1967). Section 401 of Title IV,16 which addresses the subject of criminal jurisdiction over Indian country, provides: “The consent of the United [115]*115States is hereby given to any State not having jurisdiction over criminal offenses committed by or against Indians in the areas of Indian country situated within such State to assume, with the consent of the Indian tribe occupying the particular Indian country or part thereof which could be affected by such assumption, such measure of jurisdiction over any or all of such offenses committed within such Indian country or any part thereof as may be determined by such State to the same extent that such State has jurisdiction over any such offense committed elsewhere within the State, and the criminal laws of such State shall have the same force and effect within such Indian country or part thereof as they have elsewhere within that State.” (Emphasis added.) 25 U.S.C. § 1321 (a). “The method of a state’s assumption of criminal jurisdiction is not specified by § 401 [25 U.S.C. § 1321 (a)], but is found in § 406 codified in 25 U.S.C. § 132617 . . . Mashantucket Pequot Tribe v. McGuigan, 626 F. Sup. 245, 247 (D. Conn. 1986).
In 1983, Congress enacted the Settlement Act for the purpose of settling tribal claims to much of the private and public lands located in Ledyard. Mashantucket Pequot Tribe v. McGuigan, supra, 626 F. Sup. 246-47.18 [116]*116Section 6 of the act, codified at 25 U.S.C. § 1755, which addresses the subject of state jurisdiction over the Mashantucket Pequot tribe’s reservation, provides: “Notwithstanding the provision relating to a special election in section 4-06 [of the Indian Civil Rights Act], the reservation of the Tribe is declared to be Indian country subject to State jurisdiction to the maximum extent provided in title IV of such Act. ” (Emphasis added.)
In the present case, the defendant claims that even if the Settlement Act eliminates the requirement for a special election pursuant to 25 U.S.C. § 1326, it does not eliminate the general consent requirement contained in 25 U.S.C. § 1321 (a). The defendant also claims that since the tribe has never consented to the state’s assumption of jurisdiction over offenses committed by Indians on the Mashantucket Pequot reser[117]*117vation, the state lacks such jurisdiction and, therefore, the defendant’s motion to dismiss must be granted.
I
We first address the issue of whether the Settlement Act dispenses with the special election requirement contained in 25 U.S.C. § 1326. The trial court concluded that the plain meaning of 25 U.S.C. § 1755 “clearly indicates the intent of Congress to dispense with the special election requirement of § 406 [of Title IV of the Indian Civil Rights Act, codified at 25 U.S.C. § 1326].”
“It is the duty of the court to ‘interpret statutes as they are written’; Muha v. United Oil Co., 180 Conn. 720, 730, 433 A.2d 1009 (1980); and not ‘by construction read into statutes provisions which are not clearly stated.’ Glastonbury Co. v. Gillies, 209 Conn. 175, 179, 550 A.2d 8 (1988).” State v. Johnson, 227 Conn. 534, 542, 630 A.2d 1059 (1993). Where the “ ‘will of Congress . . . has been expressed in reasonably plain terms, that language must ordinarily be regarded as conclusive.’ ” Negonsott v. Samuels, supra, 507 U.S. 104, citing Griffin v. Oceanic Contractors, Inc., 458 U.S. 564, 570, 102 S. Ct. 3245, 73 L. Ed. 2d 973 (1982).
Section 1755 of title 25 of the United States Code provides: “Notwithstanding the provision relating to a special election in section 406 of the [Indian Civil Rights Act] . . . .” The plain language of this statute clearly indicates that Congress intended to dispense with the special election requirement that is otherwise required in order for a state to assume criminal jurisdiction over crimes committed by Indians in Indian country. We conclude, therefore, that the trial court properly determined that 25 U.S.C. § 1755 dispenses with the special election requirement contained in 25 U.S.C. § 1326.
II
We next address the issue of whether the Settlement Act dispenses with the general consent requirement [118]*118contained in 25 U.S.C. § 1321 (a). The trial court stated that “ ‘[t]he primary concern of Congress in enacting Public Law [83-280] that emerges from its sparse legislative history, was with the problem of lawlessness on certain Indian reservations, and the absence of adequate tribal institution for law enforcement.’ . . . Since the Settlement Act dispenses with this special election and grants criminal jurisdiction in the State of Connecticut without the requirements of any such vote, it must be concluded that criminal jurisdiction has been fully vested in the State of Connecticut.” Initially, we note that the language contained in 25 U.S.C. § 1755 is ambiguous because, although it “eliminates the consent election provided in 25 U.S.C. § 1326, it may have created an anomaly by the fact that it does not eliminate the consent requirement of 25 U.S.C. § 1321 [a].” Mashantucket Pequot Tribe v. McGuigan, supra, 626 P. Sup. 248. Since the statutory language is unclear, we must determine whether Congress intended to eliminate the general consent requirement contained in § 401 of Title IV, codified at 25 U.S.C. § 1321 (a).
“It is fundamental that statutory construction requires us to ascertain the intent of the legislature and to construe the statute in a manner that effectuates that intent.” State v. Johnson, supra, 227 Conn. 541. “If the statutory language is unclear, the intent of the legislature may be ascertained by looking to the legislative history and to the purpose that the statute was intended to serve.” Id., 542. “Furthermore, it is a well established rule of statutory construction that repeal of the provisions of a statute by implication is not favored and will not be presumed where the old and the new statutes, in this case [25 U.S.C. § 1321 (a) and 25 U.S.C. § 1755], can peacefully coexist.” McCarthy v. Commissioner of Correction, 217 Conn. 568, 578, 587 A.2d 116 (1991). “ ‘In the interpretation of a statute, [119]*119a radical departure from an established policy cannot be implied. It must be expressed in unequivocal language.’ ” Id. “The legislature is presumed to be aware and to have knowledge of all existing statutes and the effect which its own action or nonaction may have on them.” Windham First Taxing District v. Windham, 208 Conn. 543, 554, 546 A.2d 226 (1988).
As we noted previously, Congress enacted Title IV of the Indian Civil Rights Act in response to “congressional dissatisfaction with the involuntary extension of state jurisdiction over Indians who did not feel they were ready to accept such jurisdiction, or who felt threatened by it.” Three Tribes II, supra, 476 U.S. 892, citing S. Rep. No. 721, 90th Cong., 1st Sess., p. 32 (1967). Congress concluded that tribes were critical of Public Law 83-280 “because it authoriz[ed] the unilateral application of State law to all tribes without their consent and regardless of their needs or special circumstances.” Id. (views of Senator Sam Ervin). The Indian Civil Rights Act amended Public Law 83-280 so that any State not presently having civil and criminal jurisdiction over Indian tribes would be required to obtain the consent of the tribes before assuming such jurisdiction. In order to verify that tribal members were in fact “ready to accept such jurisdiction,” Congress enacted § 406 of Title IV, 25 U.S.C. § 1326. Section 406 provides that tribal consent may be manifested only by a majority vote of the tribe’s enrolled adult Indians, voting in a special election held for that purpose. Kennerly v. District Court of Montana, 400 U.S. 423, 429, 91 S. Ct. 480, 27 L. Ed. 2d 507 (1971).19
[120]*120Essentially, Congress enacted only one tribal consent requirement, embodied in § 401, codified at 25 U.S.C. § 1321 (a), and one method by which consent must be demonstrated, embodied in § 406, codified at 25 U.S.C. § 1326. “The method of a state’s assumption of criminal jurisdiction is not specified by § 401 [25 U.S.C. § 1321 (a)], but is found in § 406 [25 U.S.C. § 1326] . . . wherein the election to effectuate consent is set forth and is mandatory.” Mashantucket Pequot Tribe v. McGuigan, supra, 626 F. Sup. 247. After tribal consent is manifested by the method prescribed in § 406, “the criminal laws of such State shall have the same force and effect within such Indian country or part thereof as they have elsewhere within that State.”20 Id.; see 25 U.S.C. § 1321 (a).
In light of the legislative history of the Indian Civil Rights Act and the case law interpreting § 401 of the Indian Civil Rights Act, we conclude that Congress, by enacting 25 U.S.C. § 1755, did not intend to dispense with the general consent requirement embodied in 25 U.S.C. § 1321 (a). “If the legislature had intended by [121]*121enacting [25 U.S.C. § 1755] to do away with the longstanding policy of [the general consent requirement], it could easily have said so.” See McCarthy v. Commissioner of Correction, supra, 217 Conn. 578. In fact, Congress did not do so; it merely removed the specific procedure by which tribal consent must be manifested.
Ill
Finally, we address the issue of whether the Mashantucket Pequot tribe has consented to the state’s assumption of criminal jurisdiction over offenses committed by Indians on the Mashantucket Pequot reservation. Both the state and the defendant cite portions of the Mashantucket Pequot Tribal Ordinance (M.P.T.O.) No. 112091-0121 to support their argument. As we stated earlier, it is our duty to “interpret statutes as they are written.” Muha v. United Oil Co., supra, 180 Conn. 730. [122]*122“In the interpretation of a statute, a radical departure from an established policy cannot be implied. It must be expressed in unequivocal language.” (Internal quotation marks omitted.) Iacomacci v. Trumbull, 209 Conn. 219, 222, 550 A.2d 640 (1988).
The plain language of M.P.T.O No. 112091-01 does not amount to an “unequivocal expression” of tribal consent. On its face, the ordinance merely appears to •acknowledge and address the well established principle that tribal courts lack inherent authority to punish a person who is not Indian on the reservation, and may not exercise such jurisdiction without the consent of Congress. See Oliphant v. Suquamish Indian Tribe, 435 U.S. 191, 210, 98 S. Ct. 1011, 55 L. Ed. 2d 209 (1978). Absent an unequivocal expression of consent by the tribe, we are unwilling to imply such consent. Our conclusion that the tribe has not consented to such jurisdiction is also supported by the language contained in subsequent tribal ordinances.22
We conclude, therefore, that the plain language of the Mashantucket Pequot Tribal Ordinances does not unequivocally express the tribe’s consent to the assumption by the state of jurisdiction over offenses committed on the reservation by Indians. Indeed, the plain language of the ordinances expressly denies such consent.
In sum, we conclude that although § 6 of the Settlement Act, codified at 25 U.S.C. § 1755, dispenses with [123]*123the special election requirement of 25 U.S.C. § 1326, it does not dispense with the general consent requirement of 25 U.S.C. § 1321 (a). Since 25 U.S.C. § 1321 (a) requires that tribal consent be manifested prior to “the criminal laws of the state having the same force and effect within Indian country as they have elsewhere within the state,” and the Mashantucket Pequot Tribe has never consented to the state’s assumption of criminal jurisdiction, we hold that 25 U.S.C. § 1755 does not vest the state with criminal jurisdiction over criminal offenses committed by Indians on the Mashantucket Pequot reservation.
The judgment is reversed and the case is remanded with direction to grant the defendant’s motion to dismiss.
In this opinion the other judges concurred.