The State of Alaska and its people forever disclaim all right and title in or to any property belonging to the United States or subject to its disposition, and not granted or confirmed to the State or its political subdivisions, by or under the act admitting Alaska to the Union. The State and its people further disclaim all right or title in or to any property, including fishing rights, the right or title to which may be held by or for any Indian, Eskimo, or Aleut, or community thereof, as that right or title is defined in the act of admission. The State and its people agree that, unless otherwise provided by Congress, the property, as described in this section, shall remain subject to the absolute disposition of the United States. They further agree that no taxes will be imposed upon any such property, until otherwise provided by the Congress. This tax exemption shall not apply to property held by individuals in fee without restrictions on alienation.