Here is the form Elizabeth Warren filled out for the State Bar of Texas claiming American Indian heritage.
https://twitter.com/AmyEGardner/status/1092941590555971585
https://www.washingtonpost.com/politics/elizabeth-warren-apologizes-for-calling-herself-native-american/2019/02/05/1627df76-2962-11e9-984d-9b8fba003e81_story.html