George David Birkhoff
Harvard mathematician (1884–1944) whose proof of the ergodic theorem and work on dynamical systems made him the leading American mathematician of his era.

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1761: American politician (1761–1816) who served in Congress and in Presidential Cabinets of John Adams and Thomas Jefferson.
Future2026: America’s 250th — July 4, 2026.
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- 1884
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