Answer the following question: Given the following passage  "Approximately 66,000 people of Native American heritage live in Montana. Stemming from multiple treaties and federal legislation, including the Indian Appropriations Act (1851), the Dawes Act (1887), and the Indian Reorganization Act (1934), seven Indian reservations, encompassing eleven tribal nations, were created in Montana. A twelfth nation, the Little Shell Chippewa is a "landless" people headquartered in Great Falls, recognized by the state of Montana but not by the U.S. Government. The Blackfeet nation is headquartered on the Blackfeet Indian Reservation (1851) in Browning, Crow on the Crow Indian Reservation (1851) in Crow Agency, Confederated Salish and Kootenai and Pend d'Oreille on the Flathead Indian Reservation (1855) in Pablo, Northern Cheyenne on the Northern Cheyenne Indian Reservation (1884) at Lame Deer, Assiniboine and Gros Ventre on the Fort Belknap Indian Reservation (1888) in Fort Belknap Agency, Assiniboine and Sioux on the Fort Peck Indian Reservation (1888) at Poplar, and Chippewa-Cree on the Rocky Boy's Indian Reservation (1916) near Box Elder. Approximately 63% of all Native people live off the reservations, concentrated in the larger Montana cities with the largest concentration of urban Indians in Great Falls. The state also has a small Métis population, and 1990 census data indicated that people from as many as 275 different tribes lived in Montana.",  answer the following question. Note that the answer is present within the text.  Question: How did the eleven tribal nations in Montana get recognized?
Answer:
multiple treaties and federal legislation