“I am not yet prepared to pass a sweeping act of naturalization by which all the Indian savages, wild or tame, belonging to a tribal relation, are to become my fellow-citizens and go to the polls and vote with me,” argued Michigan Senator Jacob Howard at the time, according to the Native American Voting Rights Coalition.
Some Indigenous people didn’t seek U.S. citizenship since they were already part of their own sovereign nations. However, these nations still found their land and the lives of their people subject to the whims of a country that would not recognize them as citizens.
In any case, Congress didn’t guarantee Native people voting rights at that time either. The Constitution gave states the right to determine voting rights (with the exception of the 15th and 19th Amendments, which many states violated anyway by preventing Black people from voting).
There were plenty of white Americans who didn’t want Native people voting in their states. In the late 1930s, “One of the Indians went over to Old Town once to see some official in the city hall about voting,” reported Henry Mitchell, an “Indian Canoe Maker” in Maine. “He said to the Indian, 'We don't want you people over here. You have your own elections over on the island, and if you want to vote, go over there.’”