Final answer:
The Monroe Doctrine justified US involvement in supporting Cuban independence due to its stand against European colonization in the Americas and the economic interests of US businesses.
Explanation:
The Monroe Doctrine was used to justify the United States' involvement in supporting Cuban independence by emphasizing the U.S.'s stance against European powers colonizing newly independent countries in the Americas. The doctrine was invoked to support Cuba's fight for independence from Spanish rule, aligning with the U.S.'s interests in preventing European interference in the region. Additionally, US businesses saw opportunities in investing in Cuban agriculture, further motivating U.S. involvement in supporting Cuban independence.
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