Final answer:
The Snyder Act gave Indigenous Americans U.S. citizenship, opening up the opportunity for voting rights.
Step-by-step explanation:
The historical impact of the Snyder Act was that it gave Indigenous Americans U.S. citizenship, opening up the opportunity for voting rights. The act, also known as the Indian Citizenship Act of 1924, granted citizenship to all Native Americans born in the United States. This allowed them to participate in the electoral process and exercise their right to vote.