That is correct.
Crops like sugar cane, tobacco, and cotton needed lots of physical labor to plant and harvest them. Large plantations used slaves for labor.
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I believe it is B. The purpose establishment of the League of Nations was to resolve international conflicts without war.
Choice A doesn't really make sense because neutral nations don't join war alliances; they remain neutral. Choice C and D actually would lead to more wars because Germany was bitter about being forced to accept the defeat. They further had to pay for the reparations, which wouldn't make anyone happy.
Women were asked to work in factories during World War I because Omost women could be paid less than men. most men were away fighting in the war.
The Tet offensive altered public opinion of the war because the "<span>(B) U.S. suffered heavy losses". Although it ended with a US and South Vietnamese victory, many Americans grew wary of the costs. </span>