Which best describes the way historicans consider letters and journals?

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

the answer is c.

i hope this .

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d.)   when the us left nato after the end of the cold war and they had to evolve to focus on more humanitarian measures with the smaller budget