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Alexander Hamilton was one of the Founding Fathers of the United States and played a crucial role in the establishment of the U.S. government. He was a key advocate for the ratification of the U.S. Constitution, writing several influential essays in support of the document. As the first Secretary of the Treasury, Hamilton implemented a series of financial policies that laid the foundation for a strong central government and a stable national economy. His initiatives included establishment of the national bank, assumption of state debts, and the promotion of a manufacturing-based economy.