The discovery doctrine, or doctrine of discovery, is a disputed interpretation of international law during the Age of Discovery, introduced into United States municipal law by the US Supreme Court Justice John Marshall in Johnson v. McIntosh (1823). In Marshall's formulation of the doctrine, discovery of territory previously unknown to Europeans gave the discovering nation title to that territory against all other European nations, and this title could be perfected by possession. A number of legal scholars have criticized Marshall's interpretation of the relevant international law. In recent decades, advocates for Indigenous rights have campaigned against the doctrine. In 2023, the Roman Curia of the Vatican formally repudiated the doctrine.

John Cabot (Italian: Giovanni Caboto [dʒoˈvanni kaˈbɔːto]; c. 1450 – c. 1499) was an Italian navigator and explorer. His 1497 voyage to the coast of North America under the commission of Henry VII, King of England is the earliest known European exploration of coastal North America since the Norse visits to Vinland in the eleventh century. To mark the celebration of the 500th anniversary of Cabot's expedition, both the Canadian and British governments declared Cape Bonavista, Newfoundland as representing Cabot's first landing site. However, alternative locations have also been proposed.

During the Age of Discovery, a large scale colonization of the Americas, involving a number of European countries, took place primarily between the late 15th century and the early 19th century. The Norse explored and colonized areas of Europe and the North Atlantic, colonizing Greenland and creating a short-term settlement near the northern tip of Newfoundland circa 1000 AD. However, due to its long duration and importance, the later colonization by the European powers involving the continents of North America and South America is more well-known.