Answer:
The answer is below
Step-by-step explanation:
1. Reason why the United States was Justified in the way that they acquired Texas, because, before the Mexico-American war, the then United States President James K. Polk claimed that Mexicans in their war against the Independence of Texas had invaded US territory and shed American blood on American soil.
2. On the other hand, the reason why the United States was not Justified in the way that they acquired Texas is that the then President of the United States James Polk only aggravates the needs of the Mexico-American war, because he only believed in the doctrine of Manifest Destiny which states that the United States should expand its territories from the coast (East) to coast (West)