The correct answer should be African-Americans
They were segregated and had hard times finding jobs and when they did manage to get them, it was mostly low-skilled low-paying physical jobs like carrying bags of cement or loading ships in the docks. When the great depression came, they lost even this because white workers were prepared to do even those jobs so they lost even the little wage that they had.
The Classical Era set the scene. It brought us the major civilizations, religions, and trade routes. But, what happens when all of the major world powers collapse? This is the Post-Classical era. The major world powers come from places you might not expect. There are some powers that are similar to the ones before and the ones after (Byzantine, China). But, the major players in the Post-Classical era come from totally backwards places. One sprouts out of a cave in the Arabian desert. The other comes from the base of a mountain on the steppes in Central Asia. I call this era, Muslims & Mongols. That's not everything, but it just about sums up the basics. (Of course, Trade, Migrations, Religion, and Labor are important...) The Post Classical Era is the FIRST era that represents 20% of the test. From here on out, these eras are worth more than the first two.
Because of widespread fear of a strong central government at the time they were written and strong loyalties among Americans to their own state as opposed to any national government during the American Revolution, the Articles of Confederation purposely kept the national government as weak as possible and the states as independent as possible. However, this led to many of the problems that became apparent once the Articles took effect.
(in the Vietnam War) the US policy of withdrawing its troops and transferring the responsibility and direction of the war effort to the government of South Vietnam.