Answer:
a policy of extending a country's power and influence through diplomacy or military force:
Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well.
The new plan of government centralized power in the federal government at the expense of state authorities. American leaders sought to draft the Constitution as a new plan of government.
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