Feast of Nuestra Sra. de Altagracia, or Our Lady of Highest Grace, the patron virgin of the Dominican Republic.

Treaty of Guadalupe Hidalgo (Mexico). This treaty, which marked the end of the Mexican War, established U.S. sovereignty over 1,193,061 square miles of formerly disputed or Mexican territory, including the present states of Texas, Arizona, California and Utah, and parts of New Mexico, Colorado, and Wyoming.

Dominican Republic Independence Day and beginning of Dominican Carnival. The pre-Lenten celebration coincides with the anniversary of the Dominican Republic’s Independence from Haiti.

Battle of Rivas Day (Costa Rica): Anniversary of victory over Confederate invaders in 1856. An army consisting mainly of farmers armed with machetes forced William Walker, an American who planned to enslave Central American countries, back into Nicaragua.

Landing of the 33 Patriots Day (Uruguay). Anniversary of the landing of thirty-three exiles in 1825, who began a campaign leading to Uruguay’s independence.

Primero de Mayo or Día del Trabajo or Día del Trabajador; a national holiday celebrated in most Spanish-speaking countries, equivalent to the U.S. Labor Day.