What is the highest elected office held by a Native American in United States history?

by cascadianow

This question popped into my head, and I'm not really even where to start researching.

Thanks for your time /r/AskHistorians!

JoieDeBeavre

Charles Curtis was Vice President under Herbert Hoover (1929 -1933). He was half Native American, his mother being a part of the Kaw Nation. Before serving as VP he was in the Senate and the House. He served as both Senate Minority Whip and Senate Majority Leader.