American System is an economic plan devised by Henry Clay and John C. Calhoun
Answer:
During the 1790s, the young republic faced many of the same problems that ... born in anti-colonial revolutions, the United States faced the challenge of building a sound ... The U.S. Constitution created a general framework of government.
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They contributed to World War 1 through the assassination of Archduke Franz Ferdinand. The Black Hand was part of a Pan-Slavist movement in which they wanted to unite territories of South Slave that had been annexed by Austria-Hungry. Hopefully this helps.
