What was one effect of the Roosevelt corollary on Latin America? A. The United States built a canal in Panama.
B. Latin America sent United States troops back home.
C. Latin America was opened up to European colonialism.
D. The United States was unable to collect debts in Latin America.

Correct answer is A. The United States built a canal in Panama.

Explanation:

Option A is the correct one. President Roosevelt decided to create a canal after United States gained control of the area. They started building the channel in 1904, and was finished by 1914.

Option B is not correct as Latin American states weren't able to prevent United States to show their strength in this period.

Option C is not correct as United States prevented any new colonialism of continent.

Option D is not correct as United States totally had political control on the continent.

to extend a country’s power and influence

profound political, administrative, and social changes in the british isles.