Final answer:
Many Americans were in favor of going to war with Mexico for reasons including Manifest Destiny, border disputes, and economic motivations.
Step-by-step explanation:
Many Americans were in favor of going to war with Mexico for several reasons. One reason was the concept of Manifest Destiny, which was the belief that it was America's destiny to expand its territory from coast to coast. Mexico controlled a large part of the land that the US wanted, so war was seen as a way to acquire that land.
Another reason was the dispute over the Texas-Mexico border. The US claimed that the border was the Rio Grande, while Mexico claimed it was the Nueces River. This disagreement led to tension and eventually military conflict.
Finally, there were economic motivations for going to war. Some Americans believed that war with Mexico would open up new trade opportunities and access to valuable resources, such as gold and silver.
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