Three. Zachary Taylor, Franklin Pierce, US Grant. In addition, the future Confederate President, Jefferson Davis, also served in Mexico.
The Mexican War was 1846-48. Only one President, Polk, served during that time.
He served in the Mexican American War. Worked as a Clerk. Tanned leather. He served in the US Civil War.
John Quincy Adams was in opposition to the Mexican War. John Quincy Adams served as the 6th President of the United States.
The US was not at war while Pierce was the President. Pierce saw action in the Mexican War and served in the army until the war ended before he was president
Jefferson F. Davis was president of the Confederate States of America and served in the Mexican American War and Black Hawks War. As an aside, Jefferson Davis was a West Point graduate and served as the US Secretary of War.
Taylor was instrumental in winning the Mexican War and served as the 12th US President.
Jefferson Davis served in two wars prior to his political positions in the US government. He served in the Black Hawk War and the Mexican War.
William McKinley served as a lieutenant under Rutherford Hayes during the Civil War. Ulysses Grant served as a 2nd Lieutenant under Zachary Taylor during the Mexican War. James Monroe served as a major under George Washington during the Revolutionary War.
Zachary Taylor and Ulysses S. Grant. Franklin Pierce also served and played a more prominent role than did Grant.
Jefferson Davis was the president of the Confederacy and he served in the black hawk war in 1832. NEW RESPONDENT- IMPROVEMENT. He fought also in the Mexican-American War of 1846-1848.
Pierce served as a brigadier general in the Mexican War.
Grant received his first commission in 1843, served in the Mexican War and resigned his commission in 1854. He returned to the army for the the Civil War and served from 1861 to 1869 when took office as President.