The roosevelt corollary to the monroe doctrine called for

a) investing in the economic development of latin america.

b) pledging to japan and russia negotiate a peace settlement.

c) prohibiting foreign countries from purchasing land in the western hemisphere.

d) intervening in latin american countries that could not pay their debt to european creditors.

 D)intervening in Latin American countries that could not pay their debt to European creditors.

Explanation: The Roosevelt Corollary (1904) to the Monroe Doctrine called for intervening in Latin American countries that could not pay their debt to European creditors. The Monroe Doctrine (1823) had pledged to keep European nations from intervening in Latin America, but as the countries there struggled economically in the late 19th and early 20th centuries, the U.S. offered to help them rather than let Europe invest there. This was a bigger issue as the U.S. became involved in the Panama Canal project in the early 1900s.

they believed democracy was worth the fight

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.