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How did the voting rights act and the 15th amendment combine to improve individual rights for african americans

Examine these two paintings that depict famous events from american history. the image on the left, painted in 1940, shows the signing of the u.s. constitution in 1787. the image on the right, painted in 1836, shows the american victory at the battle of yorktown in 1781.which of these paintings should be considered a secondary source?

What was the result of delegates from the democratic party not being able to nominate a candidate in 1860