In Central America, President Coolidge ordered American Marines into Nicaragua when President Adolfo Diaz faced a revolt from opposition groups. The United States gave its support to more conservative groups in Nicaragua. And it helped arrange a national election in nineteen twenty-eight. American troops stayed in Nicaragua until nineteen thirty-three.
However, American troops withdrew from the Dominican Republic during this period. And Secretary of State Hughes worked to give new life to the Pan American union.
Relations with Mexico became worse during the nineteen-twenties. In nineteen twenty-five, Mexican President Plutarco Elias Calles called for laws to give Mexico more control over its minerals and natural wealth. American oil companies resisted the proposed changes. They accused Calles of communism. And some American business and church leaders called for armed American intervention.
However, the American Senate voted to try to settle the conflict peacefully. And American diplomat Dwight Morrow helped negotiate a successful new agreement.