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Why is it useful for historians to base certain studies on the analysis of historical periods

How many battles were confederate victories? (specifically: major battles)

Hich explains why the constitution gave congress the power to create a system of federal courts? the constitution wanted congress to share power with the judicial branch. the constitution anticipated the need for courts lower than the supreme court. the constitution wanted congress to share power with the appellate courts. the constitution anticipated the need for courts equal to the supreme court.