Answer:
Monroe Doctrine & The Panama Canal
Step-by-step explanation:
Hi there,
Before I respond, I will assume that you are referring to Theodore Roosevelt's administration.
One of the reasons that led to American imperialism was the Monroe Doctrine. This doctrine pretty much warned European powers to not interfere or spread their influence in the Americas. This allowed the US to maintain their sphere of influence in the region and take territories like Puerto Rico.
Another cause of imperialism was the construction of the Panama Canal. Since the US wanted to build a canal for cross-country commerce and easier mobility of warships, they seized control of parts of Panama. The need to create the canal caused the US to colonize this region. It is also important to note that the US colonized other territories such as Hawaii, Guam, and the Philippines.
Please note that these are only two cause of American imperialism. There are certainly more factors that can be mentioned.
Hope this was helpful. Cheers.
- former AP US student :^)