Monroe Doctrine: was a U.S. foreign policy regarding European countries in 1823. It stated that further efforts by European nations to colonize land or interfere with states in North or South America would be viewed as acts of aggression, requiring U.S. intervention.
Spanish American War: A war between Spain and the United States, fought in 1898. The war began as an intervention by the United States on behalf of Cuba.
The Roosevelt Corollary was an addition to the Monroe Doctrine articulated by President Theodore Roosevelt in his State of the Union address in 1904 after the Venezuela Crisis of 1902–03.
Panama Canal: canal about 50 miles (80 km) long, across the Isthmus of Panama, that connects the Atlantic and Pacific oceans.
Santa Ana: a city in El Salvador, close to the border with Guatemala
Benito Juarez: was a Mexican lawyer and politician of Zapotec origin from Oaxaca who served as the president of Mexico for five terms.
Pancho Villa: Mexican revolutionary; born Doroteo Arango. He helped Venustiano Carranza to overthrow the dictatorial regime of General Victoriano Huerta in 1914, but then helped Emiliano Zapata to rebel against Carranza's regime.
Emiliano Zapata: was a leading figure in the Mexican Revolution, the main leader of the peasant revolution in the state of Morelos, and the inspiration of the agrarian movement called Zapatismo.
