What were six important sets of actions and reactions in the years 1824 to 1846 that lead to war between the US and Mexico?

Actions and reactions during the year 1824-1848 which results in US and Mexico War is given below.

Explanation:

When Mexico got independence from Spain in 1821, Texas was part of Mexico.Americans and other settlers came into Texas when Mexico allowed non-Spanish settlers to settle there.After many settlers came to Texas, disputes led to the Texas Revolution in which 1836 Texas became independent.Mexico refused to recognize the republic of Texas, as an independent country. Texas soon asked to become a state of the United States. The United States moved quickly to annex Texas after the 1844 election of James K. Polk. In his campaign, Polk had called for the "re-annexation" of Texas and the "re-occupation" of the Oregon Territory.[3] Polk also wanted California and the rest of what is now the Southwestern United States.In 1845, the US annexed Texas.[4] But Mexico still did not recognize its independence or recognize the annexation by the U.S.The United States offered to buy from Mexico the land extending from Texas to the Pacific Ocean, but Mexico wanted to keep that vast area. In 1846, a dispute over the border between Texas and Mexico resulted in armed conflict, and the Mexican–American War began. After offering to buy the territory, Polk moved U.S. troops into a place that Mexico said was not in Texas, but rather part of the Mexican state of Coahuila. The Mexican army attacked them. The main cause of the war was the westward expansion of the United States. All through the 19th century Americans believed it was their right to expand westward.[5] At the time they believed they could conquer the people already living on the land and take it for the United States. Southerners wanted to see more slave states.