<u>Answer:</u> D. National Origins Act
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Europe concentrated on developing its political and cultural institutions. The early years of the middle ages were marked by he absence of an effective central gov't and the constant treat of famine, disease, and foreign invasions
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I also feel like the answer is A.)
With war, every country is afraid. They're afraid of possibly being ambushed, becoming in dept, and many other reasons. So by remaining neutral they can sit back and not have to worry about being attacked by any country that's fighting. But that's not always the case now and days. Hope I answered your question correctly.