Briefly explain how the concept of Manifest Destiny relates to the events or views expressed in the document.

The document to which this question refers is the justification for the Mexican-American War.

The document shows how it was America's duty and responsibility for Americans to dominate and spread across the territories from the Atlantic to the Pacific.

Explanation:

Manifest Destiny claimed that the USA had received from God the duty and responsibility to dominate the territories that stretched from west to pacific, in which case, dominating Mexico was a way of fulfilling the divine destiny that had fallen on the country, making with America to dominate a territory large enough to give it more power and influence to dominate the next territories.