Imperialism

Monroe Doctrine:

The 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 US in the Caribbean and the Philippines in 1898. American public opinion having been aroused by Spanish atrocities in Cuba and the destruction of the warship Maine in Santiago harbor, the US declared war and successfully invaded Cuba, Puerto Rico, and the Philippines, all of which Spain gave up by the Treaty of Paris (1898).

: Roosevelt Corollary

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:

a canal about 50 miles (80 km) long, across the Isthmus of Panama, that connects the Atlantic and Pacific oceans. Its construction, begun by Ferdinand de Lesseps in 1881, was abandoned in 1889 and was completed by the US, 1904–14. Control of the canal remained with the US until 1999, when it was ceded to Panama

Santa ana:

a city in El Salvador, close to the border with Guatemala; pop. 245,421 (2007).

Benito Juarez:

(Biography) Benito Pablo (beˈnito ˈpaβlo). 1806–72, Mexican statesman. As president (1861–65; 1867–72) he thwarted Napoleon III's attempt to impose an empire under Maximilian and introduced many reforms

pancho villa and Emiliano zapata:
The Mexican Revolution, which began in 1910, ended dictatorship in Mexico and established a constitutional republic. A number of groups, led by revolutionaries including Francisco Madero, Pascual Orozco, Pancho Villa and Emiliano Zapata, participated in the long and costly conflict.