If you're asking in general then, the area has to have people who share common customs, belief and language.However, this might not entirely be true as there are some countries which have vast diversity and still portray nationalism.
Hope this helps!!
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I think your answer is D. Accurate calendar systems.
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federal constitution? sorry if i didnt get it right
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Roosevelt approached foreign disputes as diplomatic negotiations that he would put force behind only if necessary. Truman on the other hand, made quick decisions and did what was necessary whether it was using force or negotiating.
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