Why were these amendments important to African Americans after the
Civil War?

The Reconstruction amendments were a part of implementing the Reconstruction of the American South after the war. ... These amendments were intended to guarantee the freedom of former slaves and to establish and prevent discrimination in certain civil rights to former slaves and all citizens of the United States.

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native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.