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Tompkins served two terms as Vice President, from 1817 to 1825. He was elected alongside President James Monroe in both the 1816 and 1820 elections. Tompkins's tenure as Vice President was marked by his support for Monroe's policies, including the Monroe Doctrine. He also played a role in the negotiations that led to the Adams-Onís Treaty, which established the border between the United States and Spanish Florida.