If it became law, the Save Act would require Americans to provide a birth certificate, passport, or other citizenship document to register or re-register to vote. Per one Brennan Center Study, more that 21 million American citizens, many of whom are engaged voters, do not have easy access to these documents. While just over 8% of self-identified white American citizens don’t have these documents readily available, the Brennan Center found the number is nearly 11% among Americans of color.