Among the groups mentioned, African Americans gained significant political participation due to amendments added to the Constitution. Notably, the 15th Amendment (ratified in 1870) granted African American men the right to vote, and the Civil Rights Movement in the 1960s led to further legal protections for their voting rights through the Voting Rights Act of 1965.
While other groups like Native Americans, Asian Americans, and Hispanic Americans have also seen changes in their political participation over time, the most significant constitutional amendments directly enhancing voting rights pertain to African Americans.
If you're looking for a specific answer based on historical context regarding constitutional amendments, it would be African Americans.
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