Andrew Jackson campaigned for Polk and may have helped. A third party abolitionist candidate, James Birney undercut slave owner Clay and likely cost him New York.
James Knox Polk won the presidential election of 1844 because he was the "candidate of expansion".
True, the largest issue in the election of 1844 was expansion. Whig Party representative Henry Clay was opposed to expansion, while democratic nominee James Polk claimed that they had the right to annex any land that was willing. It was that mindset that helped James Polk win the election.
manifest destiny is a time period in the USA where we wanted more power, we wanted more land from the west. so James Polk was all for moving west and that's the main reason why he was elected
Television helped Kennedy to win the 1960 election because was a handsome, younger man.
the civil war
spoils system
his gifts as a polished communicator
Phil Sheridan laying waste to the Shenandoah Valley.
Abraham Lincoln was assassinated in 1865. Ulysses S. Grant won the 1868 U. S. Presidential Election.
Hoover won the election because he promised to change many things for Americans. He was also popular with the people before he even ran for President, so that also helped him win.
It raised Northern morale and helped Lincoln win re-election.
The capture of Atlanta, Georgia, and then the capture of Savannah, Georgia, and the Battle of Cedar Creek, Virginia, were all important factors. Additionally, General Sherman's victory in Atlanta helped Abraham Lincoln win re-election in 1864.