They're were tensions for nearly 15 years before the Archduke Franz Ferdinand of Austria and his pregnant wife Sophie were assassinated, which started WW1.
<span>C.) many of the blacks fought for the North
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This was caused by the emancipation declaration by Lincoln. Lincoln believed that the emancipation would weaken the confederation forces as it denied them manpower for the war. The emancipation was therefore a military strategy to defeat the south. the blacks therefore joined the union course serving in different cadres in the union army.
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I believe that the direct effect of the passage of the Seventeenth Amendment is that it improved representation of the people, because now they were able to directly choose Senators, which made the whole voting process a lot democratic.
With the compromise, the Republicans had quietly given up their fight for racial equality and blacks' rights in the south. In 1877, Hayes withdrew the last federal troops from the south, and the bayonet-backed Republican governments collapsed, thereby ending Reconstruction.
