Which expeditions were pivotal in the European discovery of North America?

The expeditions of Christopher Columbus, John Cabot, and Leif Erikson were pivotal in the European discovery of North America.

Christopher Columbus, an Italian explorer sponsored by the Spanish monarchy, is often credited with 'discovering' America, although he initially believed he had found a new route to Asia. His first voyage in 1492 was significant as it marked the beginning of sustained European contact with the Americas. Columbus made four voyages in total, exploring various Caribbean islands, the Gulf of Mexico, and the South and Central American mainlands, but he never actually set foot on what is now known as North America.

John Cabot, an Italian navigator and explorer, is believed to be the first European to have reached North America since the Vikings. Sponsored by England's King Henry VII, Cabot set sail in 1497 and landed on what is now Newfoundland, Canada. His discovery provided England with a claim to the 'New World' and paved the way for future English explorations and eventual colonisation of North America.

Leif Erikson, a Norse explorer from Iceland, is considered by many to be the first European to have landed in North America, specifically in what is now Newfoundland, Canada, around the year 1000, almost 500 years before Columbus and Cabot. His voyages to 'Vinland', as he called it, were documented in Norse sagas, but were largely forgotten by history until the late 19th and early 20th centuries. The discovery of the Norse settlement at L'Anse aux Meadows in Newfoundland in the 1960s provided archaeological evidence supporting the sagas' accounts of Erikson's voyages.

These expeditions were pivotal in the European discovery of North America, each contributing to the unfolding understanding of the 'New World' and its potential. They marked the beginning of a period of exploration and colonisation that would significantly shape the course of world history.