Bruh, lol... you serious?
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<u>Answer:</u> D. National Origins Act
The most important advantage in the north was the industrialization. This was the most important because weapons and other equipment were easier to manufacture.
The most important advantage of the south was that they were fighting on their land, so it was familiar to them. This was the most important because the southerners were in a space that they knew/could navigate better.
Because it involved countries all over the world, there was new technology such as chemical warfare, tanks, planes, etc. and it was unrestricted warfare. The countries were attacking civilians as well. Also there were diseases.
C. They made a treaty with China to explore the area
