What American action was considered an act of aggression against Mexico?

The settlement of foreigners in California
The land grants in California
The annexation of Texas
The move across the Oregon Trail

The annexation of Texas.

The American action that was considered an act of aggression against Mexico was the annexation of Texas.

The American action that was considered an act of aggression against Mexico was the annexation of Texas.

To understand why the annexation of Texas was seen as an act of aggression, we need to look at the historical context. In the early 19th century, Texas was a territory under Mexican control. However, in 1836, the Texas Revolution took place, resulting in Texas gaining independence from Mexico and becoming the Republic of Texas.

The annexation of Texas by the United States occurred in 1845, when it was admitted as a state. This move was met with opposition from Mexico, who viewed it as a violation of their sovereignty and an act of aggression. Mexico had never recognized the independence of Texas, so the annexation by the United States further exacerbated tensions between the two nations.

To find the answer to the question, one could examine historical documents, books, or articles that discuss the relationship between Mexico and the United States during the mid-19th century. One could also consult reputable sources such as academic journals or online databases that specialize in historical research. Additionally, one could reach out to experts in the field of history or consult relevant textbooks or encyclopedias that cover this specific period.