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Britain's Prime Minister Andy Burnham, right, and Canada's Prime Minister Mark Carney attend the League Cup third round round soccer match between Everton and Wolverhampton Wanderers, Wednesday, Sept. 16, 2026, in Liverpool, England.Justin Tang/The Canadian Press via AP)

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Between the Declaration of Independence and the election of George Washington, the one person some historians consider as the United States leader was the President of Congress. Delaware's Thomas McKean was the eighth man to hold this office.