The Mexican-American War and Reconstruction: Success or Fail?

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The Mexican-American War and Reconstruction, whether it was a success or Failure
Question1: What led to the Mexican-American war? What were the effects of American conquest and settlement on various groups? Californios, Native Americans, and ultimately Americans?
Mexican-American War, also called Mexican War, was a war wage by U. S against Mexico in the 1800s. The Mexican-American War marked the first U.S. armed conflict being carry in foreign lands. The U.S annexation of Texas could have been one of the primary causes of this conflict. In the issue of Texan Annexation, Mexico had warned it would consider annexation as an act of war. When Texan annexation was done, Mexico did not declare war but broke diplomatic relations with the U.S. Mexico claim that ended at Nueces River while the U.S argued Texas ending at the Rio Grande.
The U. S forces overcome Mexico resulting in the acquisition of thousands of square miles of Mexican border towards the westwards of the Rio Grande. At such a time, Mexico was ill-prepared politically and militarily to face the expansionist-minded administration of U.S. President James K. Polk, who express much desire to control U.S reign across the Pacific Ocean and to gain control of California and lands in the Southwest. The populist politics at the time could have exacerbated James K. Polk's expansionist desires (Class noted, Lecture 23). The conflict led to the loss of Mexico’s territories to the U.S, including present-day New Mexico, Nevada, California, Arizona, and Utah.
The American conquest on Mexican soil led to a huge expansion of America while Mexico substantial land. The expansion of America into many places, including California, led to an indication of gold, which led to unprecedented migration from many parts of the world in California. As a result, there was increased resettlement in California. The settlement was marked by citizenship proclamations where the territories that were acquired most become U.S citizens. The U.S economy underwent tremendous growth and surpassed that of the fledgling Mexican state. Morale was on the American side, which made “Mexicans “identify with the U.S. However, there was a simmering conflict at home despite the successful invasion of Mexico and subsequent annexation of various Mexican regi...