This was a congressional decision that outlawed voters being subjected to a literacy test and created federal registration for voters

Voting Rights Act 1965

This act was signed by President Lyndon B Johnson.  It outlawed discriminatory voting practices many Southern states used after the Civil War, including literacy tests.  They used these tests to try and prevent African Americans from voting, since many of them did not learn how to read.  This act outlawed this rule.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.