Mexican Cession Mexican Cession, with considerable local autonomy punctuated by several revolts and few troops sent from central Mexico, in the period from 1821–22 after independence from Spain up through 1846 when U.S. military forces seized control of California and New Mexico on the outbreak of the Mexican–American War. The northern boundary of the 42nd parallel north was set by the Adams–Onís Treaty signed by the United States and Spain in 1821 and ratified by Mexico in 1831. The eastern boundary of the Mexican Cession was the Texas claim at the Rio Grande and extending north from the headwaters of the Jojo
History of Costa Rica Following the Mexican War of Independence (1810–1821), Costa Rica became part of the independent Mexican Empire in 1821. Subsequently, Costa Rica was part of the Federal Republic of Central America in 1823, before gaining full independence in 1838. Its economy struggled due to lack of connections with European suppliers. In 1856, Costa Rica resisted United States settlers from mounting a take-over of the government. After 1869, Costa Rica established a democratic government. After the Costa Rican Civil War in 1948, the government drafted a new constitution, guaranteeing universal suffrage and the dismantling of the military. Today, Costa Rica is a