Well if you are asking about the war with Mexico that took place during 1846-1848 it would be president james k. polk.
At the start, no one. When the US finally ended its Civil War, president Lincoln offered arms and financial support to the Mexican president Benito Juarez.
James Madison was the US President in 1810.
The Mexican War was 1846-48. Only one President, Polk, served during that time.
William McKinley.
Truman at the start and Eisenhower at the end
James Knox Polk was the US president during the Mexican War.
James Knox Polk was the US president during the Mexican War.
Santa Anna
JFK fought in the Mexican American war
At the start, no one. When the US finally ended its Civil War, president Lincoln offered arms and financial support to the Mexican president Benito Juarez.
Santa Anna.
General Zachary Taylor, who won fame in the Mexican War, was the 12th US president.
John Tyler was the US President from 1841 until 1845.
President James Knox Polk.
The Mexican-American War, and the resulting Mexican Cession, were during the presidency of James K. Polk.
James Knox Polk.
James Madison was the US President in 1810.