How did Polk force Mexican surrendered?
By invading Mexico. See Mexican-American War (1846-1848)
In the disputed territory between the Nueces River and the Rio Grande River, in present-day Texas. The American president (Pres. Polk) had ordered General Zachary Taylor and his force to move south of the Nueces into the disputed zone, and there to build a supply depot at Point Isabel and a fort near the Rio Grande, just across from the Mexican city of Matamoros. The Mexican government demanded that he withdraw from the disputed area…
Hate and fear on the part of Polk is quite unlikely. They were of different political persuasions and Taylor was a loyal and obedient officer who served President Polk well in the Mexican American War. Polk was true to his pledge and did not seek a second term as President, and Taylor used his popularity gained in the Mexican American War as a route to the White House.