Though the Fifteenth Amendment, passed in 1870, granted all U.S. citizens the right to vote regardless of race, it wasn't until Congress passed the Snyder Act of 1924 that Native Americans could enjoy the rights granted by this 1870 Amendment.

The Snyder Act granted Indigenous Americans born in the U.S. full U.S. citizenship. This was due in large part because of the services Indian soldiers performed during World War I and significant lobbying efforts on behalf of Indians.

The Allotment and Attempted Assimilation Period came to a close as a result of a Government-requested study (the Merriam Report) that deemed the policies of this period a failure.