How was Zachary Taylor related to the Mexican War?

Zachary Taylor (1784–1850) achieved national fame because of his victories during the Mexican War (1846–1848). His success as a general led directly to his winning the presidency in the election of 1848. He served as president for only 16 months before dying in office.
Born into a wealthy, slave-owning family, he grew up on the Kentucky frontier. From an early age, he knew he wanted a career in the military. In 1806, he enlisted in the army, and his military career would span 40 years. In the years before the Mexican War, Taylor fought in the War of 1812 and in several wars against various Native American tribes.
The United States, against Mexico's wishes, annexed Texas in 1845. Taylor's army was sent to the border, and there was a skirmish with Mexican troops in April 1846, starting the Mexican War. Taylor won a couple of battles and then crossed the Rio Grande into Mexico. He captured Monterrey in northern Mexico. Then Taylor had several disagreements with President James Polk. He was ordered to remain on the defensive in northern Mexico. Finally, Taylor won a smashing victory at Buena Vista against a larger Mexican army in February 1847.