During the Age of Discovery, the Spanish Empire undertook several expeditions to the Pacific Northwest of North America to strengthen its colonial claims. Spanish claims to the region dated to the papal bull of 1493 and the Treaty of Tordesillas signed in 1494, reinforced in 1513 when Vasco Núñez de Balboa claimed all lands adjoining the Pacific Ocean for the Spanish Crown. However, starting in the mid-18th century, Spain's claims in the Pacific Northwest began to be contested by the British and Russians, who established fur trading posts and other settlements in the region. In response, King Charles III of Spain and his successors sent several expeditions from New Spain to present-day Canada and Alaska between 1774 and 1793 to strengthen Spanish claims.
The 1774 voyage of Juan José Pérez Hernández aboard the frigate Santiago represented the first of these expeditions undertaken during this critical period. This voyage was part of Spain's broader strategy to reinforce its territorial claims against European rivals who were increasingly encroaching on the Pacific Northwest.
These Spanish efforts to maintain control of the Pacific Northwest region ultimately proved unsuccessful. Spanish claims in the region were eventually ceded to the American government in the 1819 Adams–Onís Treaty, bringing an end to Spanish colonial ambitions in the area.
European colonization of North America accelerated after 1600, with England, France, Spain, and the Netherlands establishing competing settlements along the Atlantic coast, the St. Lawrence River, the Gulf of Mexico, and the Mississippi Valley. The first permanent English settlement at Jamestown, Virginia (1607) struggled with starvation and conflict; the Plymouth colony (1620) and the Massachusetts Bay Colony (1630) followed. By the mid-1700s, thirteen English colonies stretched along the Atlantic seaboard, governed through a mix of royal charters, proprietary grants, and elected assemblies. The colonial economy depended on tobacco in Virginia and Maryland, rice and indigo in the Carolinas, and maritime trade in New England — all increasingly reliant on enslaved African labor after 1619. Conflict with Indigenous peoples over land was continuous, punctuated by major wars including King Philip's War (1675–1676) in New England and the Yamasee War (1715–1717) in the South. The French and Indian War (1754–1763), part of the global Seven Years' War, ended French power in North America and left Britain deeply in debt — triggering the taxation disputes that would lead to revolution.
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