The Mexican Frontier, 1821–1846 The Mexican Frontier, 1821–1846 The Mexican Frontier, 1821–1846: The American Southwest Under Mexico by historian David J. Weber is a history of the part of Mexico's north and northwest that became part of the United States after the Mexican–American War. The book examines territories on the northern frontier of Mexico, including what is now Arizona, California, New Mexico, and Texas, in the twenty-five years after Mexico gained its independence from Spain. Weber emphasizes the role of Mexicans in the region through this period of transition, particularly before and during the Texas war of independence, as well as exploring the region
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