President Roosevelt intervened in Latin America - by helping any nation there that faced serious economic problems - mainly because he wanted to avoid any possibility of European military action in the Americas. Various Latin American countries (Venezuela, for instance) owed vast amounts of money to European investors, and some European countries, such as Germany and Britain, were taking actions in order to collect that money.
This intervention is called the Roosevelt Corollary to the Monroe Doctrine, a policy approved in 1823 and aimed at opposing any European intervention in the Americas.
