That man was Ulysses S. Grant, the 18th president of the United States. He was working in his father and brothers harness shop in Galena, Illinois at the outbreak of the US Civil War.
There were several generals in the Continental Army in the Revolutionary War. The most of famous of those was George Washington who later became president.
While Grant is the best known former General to later become President,two other former Generals also became President. Rutherford B. Hayes was a Major General as was James Garfield.
Thomas Jefferson was the famous anti-Federalist who later became president of the United States.
George Bush
Washington
Gerald Ford
No US president was ever a king.
Zachary Taylor and Franklin Piece were Mexican War generals and later became President. Ulysses Grant was a lower-level officer serving in this war and later achieved fame and the Presidency because of his Civil War service.
James Monroe who later became the 5th US president negotiated the Louisiana Purchase, along with Robert R. Livingston.
When Mexico became independent from Spain in 1821, it was first established as an empire, ruled by emperor Agustin I. Three years later, due to his bad administration and spending habits, some Mexican generals staged a coup d'état and the republic was established in its place, with Guadalupe Victoria as the first Mexican president.
US Grant.
eisenhower