<span>Northerners lost interest in Reconstruction was because "B. Northerners were focused on the political corruption plaguing the nation," since this was during the Progressive Era. The Progressive Era was a period of widespread social activism and political reform across the US, from the 1890s to the 1920s. The main objectives was to eliminate problems caused by industrialization, urbanization, immigration, and corruption in government.</span>
The first alternative is correct (A).
A war is a terroir scenario, where the soldiers go through very difficult times. Many lose friends, see the suffering of people, children, anyway. That way, no matter how psychologically strong a soldier is, his emotional state is shaken.
The Vietnam War itself caused many traumas, as it was a very violent war with many deaths and mutilations. In this way, soldiers who have returned alive have gone through many psychological dramas, alcohol vices, drugs, to the point of needing rehabilitation programs.
The answer should be B! It's actually kinda funny. Northerners thought that the Confederate army would be easily defeated and that the Civil War was going to begin and end at the Battle of Bull Run. So, lots of spectators watched, but they were quickly proven wrong, as the war lasted for years.
