What famous civil war leaders got their start in the mexican-american war?

It's a long list. A long list. Politically one president had served in during the Mexican-American War, Jefferson Davis was a colonel with the Mississippi Rifles and was at the Siege of Monterrey and the Battle of Buenna Vista. Most of the generals who had been in the Regular Army prior to the war had served during the Mexican-American War. Others had served in the volunteers during that war. To name a few:

Robert E. Lee

Ulysses S. Grant

Thomas J. "Stonewall" Jackson

James "Pete" Longstreet

George E. Pickett

Lewis A. "Lo" Armistead

Winfred Scott Hancock

Jefferson C. Davis (Federal general, not to be confused with the afore mentioned Confederate President)

Abner Doubleday

Joeseph E. Johnston

Richard S. Ewell

Pierre Gustave Toutant Beauregard

Daniel Butterfield

Rush Hawkins

Winfield Scott (Old Fuss and Feathers was the General in Chief of the Federal Army at the start of the war and had been the General who took Mexico City)

George H. Thomas

Joseph Hooker

Thomas W. Sherman

A. P. Hill

George B. McClellan

George Meade

George Stoneman

Famous Civil War Leaders

Mexican American War Leaders