He was afraid because of their expansionism and colonialism in North and South America.
Explanation:
- Monroe's doctrine was an American policy to oppose European colonialism in America beginning in 1823.
- In 1823, US President James Monroe rebelled against the intervention of European countries on the American continent. The doctrine said that further efforts by European states to seize control of any independent state in North or South America would be seen as "a manifestation of a hostile attitude toward the United States."
- At that moment, directed against the interventionist intentions of the Holy Alliance of European Powers towards the former Spanish and Portuguese colonies in South America, that policy later became "America to Americans" and gained a strong national character.
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They became richer and wealthier off the resources of the lands they colonized
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