William Marcy could best be describe as a Jackson supporter.
Who are Jackson supporter?
Jackson supporter were the people who supported the beginning of democratic party.
Because, the Jacksonian were the strong democratic party, who believed in the equality among the people from South and West. And the followers and supporter were termed as the Jackson supporter. So, William Marcy was the leader of democratic party so he would be best describe as the Jackson supporter.
Hence the correct option is, a Jackson supporter.
To know more about the Jackson supporter:
https://brainly.com/question/1931477
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