the present-day United States. The first confirmed European landing in the continental United States was by Juan Ponce de León, who landed in 1513 at a lush shore he christened La Florida. In the next three decades, the Spanish became the first Europeans to reach the Appalachian Mountains, the Mississippi River, the Grand Canyon and the Great Plains. Spanish ships sailed along the Atlantic Coast, penetrating to present-day Bangor, Maine, and up the Pacific Coast as far as Oregon. From 1528 to 1536, Álvar Núñez Cabeza de Vaca and three fellows (including an African named Estevanico), from a Spanish expedition that foundered, journeyed from Florida to the Gulf of California. In 1540, Hernando de Soto undertook an extensive exploration of the present United States. Also in 1540, Francisco Vásquez de Coronado led 2,000 Spaniards and Mexican natives across today's Arizona–Mexico border and traveled as far as central Kansas, close to the exact geographic center of what is now the continental United States. Other Spanish explorers of the US territory include, among others: Alonso Alvarez de Pineda, Lucas Vázquez de Ayllón, Pánfilo de Narváez, Sebastián Vizcaíno, Gaspar de Portolà, Pedro Menéndez de Avilés, Álvar Núñez Cabeza de Vaca, Tristán de Luna y Arellano, and Juan de Oñate, and non-Spanish explorers working for the Spanish Crown, such as Juan Rodríguez Cabrillo. In 1565, the Spanish created the first permanent European settlement in the continental United States, at St. Augustine, Florida. Spanish missionaries and colonists founded settlements including in the present-day Santa Fe, New Mexico, El Paso, San Antonio, Tucson, Albuquerque, San Diego, Los Angeles, and San Francisco. 18th and 19th centuries As late as 1783, at the end of the American Revolutionary War (a conflict in which Spain aided and fought alongside the rebels), Spain held claim to roughly half the territory of today's continental United States. From 1819 to 1848, the United States (through treaties, purchase, diplomacy, and the Mexican–American War) increased its area by roughly a third at Spanish and Mexican expense, acquiring its three currently most populous states—California, Texas, and Florida.. Many Hispanic natives lived in the areas that the United States acquired, and a new wave of Mexican, Central American, Caribbean, and South American immigrants had moved to the United States for new opportunities. This was the beginning of a demographic that would rise dramatically over the years. 20th and 21st centuries During the 20th and 21st centuries,