The united states believed that the capture of would lead to an end of the mexican-american war.

ANSWER:

The United States believed that "the capture of Mexico City" would put an end to the "Mexican-American War".

EXPLANATION:

The Mexican-American War rose because of the border disputes between United States and Mexico.The war was a long one and a bloody conflict which ended when the United States captured Mexico City and forced Mexican government for a peace treaty. The war was fought from California to Mexico and ended in 1847. The war ended when the Mexican government agreed to all conditions that were in favour of the US.