Exploration
In the Pacific Ocean, Jorge de Menezes (c. 1498–?), discovered Papua New Guinea. García Jofre de Loaísa (1490–1526), discovered the Marshall Islands. Explorations of the Americas began with the initial discovery of America by Christopher Columbus (1451–1506), who led a Castilian (Spanish) expedition across the Atlantic, discovering America. After the discovery of America by Columbus, a number of important expeditions were sent out to explore the Western Hemisphere. This included Juan Ponce de León (1474–1521), who discovered and mapped the coast of Florida; Vasco Núñez de Balboa (c. 1475–1519), who was the first European to view the Pacific Ocean from American shores (after crossing the Isthmus of Panama) confirming that America was a separate continent from Asia; Aleixo Garcia (14?–1527), who explored the territories of present-day southern Brazil, Paraguay and Bolivia, crossing the Chaco and reaching the Andes (near Sucre).
Hispanic and Latino Americans
In 1540, Hernando de Soto undertook an extensive exploration of the present United States. That same year Francisco Vásquez de Coronado led 2,000 Spaniards and Mexican Indians 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: 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 all, Spaniards probed half of today's lower 48 states before the first English colonization effort in 1585 at Roanoke Island off the East Coast.