They argue because they do not know what they are talking about. There is no way possible they know what happened, the only way you truly know what happened in WWI is if you were in it.
Monroe doctrine
Monroe doctrine warns European countries to not colonize or puppet monarch
The technology, logistics, and communication of the north that allowed them to defeat the south is because of their skill of having to manufacture supplies and weapons that they need for the war. They were able to create more weapons and be able to hire more soldiers.
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It impacted Africa because they made money from off of their resources and Africans thought the would gain independence
