A

Question 1.

B. The United States was in charge of the Western Hemisphere.

Explanation:

Theodore Roosevelt’s Corollary was an addition to the Monroe Doctrine that stated that America was in charge of the Western Hemisphere. The document noted that the United States would intervene as a last resort to ensure the political and economic order in the Caribbean and Latin America.

Question 2.

Answer:

A. To increase public support for the war.

Explanation:

The majority of the US population was against America’s participation in the combat, and the posters were designed to change people’s minds. During the WWI, posters, such as the one below, were used for communication, and their impact on the population was very high.

"I want you for US army" banner.
World War I Uncle Sam poster (Source: www.time.com)