President Polk started the conflict by declaring war
O ordering U. S. troops to invade the disputed area
o order the navy to blockade Mexico
Killing Mexico's leader

answer:

won re-nomination with no opposition he also had the support of his party

explanation:

it saw incumbent president andrew jackson, candidate of the democratic party, defeat henry clay, candidate of the national republican party. jackson won re-nomination with no opposition, and the 1832 democratic national convention replaced vice president john c. calhoun with martin van buren.