In 1971 the United States Congress passed the Alaska Native Claims Settlement Act (ANCSA), which settled land and financial claims for lands and resources which the peoples had lost to European Americans. It provided for the establishment of 13 Alaska Native Regional Corporations to administer those claims. Similar to the separately defined status of the Canadian Inuit and First Nations in Canada, which are recognized as distinct peoples, in the United States, Alaska Natives are in some respects treated separately by the government from other Native Americans in the United States. This is in part related to their interactions with the US government in a different historic period than indigenous peoples in the colonies and early federal period.  Europeans and Americans did not have sustained encounters with the Alaska Natives until the late nineteenth and early twentieth centuries, when many were attracted to the region in gold rushes. The Alaska Natives were not allotted individual title in severalty to land under the Dawes Act of 1887 but were instead treated under the Alaska Native Allotment Act of 1906.  It was repealed in 1971, following ANSCA, at which time reservations were ended. Another characteristic difference is that Alaska Native tribal governments do not have the power to collect taxes for business transacted on tribal land, per the United States Supreme Court decision in Alaska v. Native Village of Venetie Tribal Government (1998). Except for the Tsimshian, Alaska Natives no longer hold reservations but do control some lands. Under the Marine Mammal Protection Act of 1972, Alaska Natives are reserved the right to harvest whales and other marine mammals.

Answer this question "What changed during the late nineteenth century?" by extracting the answer from the text above.
The Alaska Natives were not allotted individual title in severalty to land under the Dawes Act of 1887 but were instead treated under the Alaska Native Allotment Act of 1906.