Which of the following helps to identify why President James Polk asked for a declaration of war against Mexico?(1 point)

Responses

Mexican troops were sent across the Rio Grande.
Mexican troops were sent across the Rio Grande.

Texas declared independence from Mexico in 1836.
Texas declared independence from Mexico in 1836.

Zachary Taylor crossed the Nueces River.
Zachary Taylor crossed the Nueces River.

Polk believed in Manifest Destiny.