A map of ye English empire in ye continent of America. Viz Virginia New York Mary Land New I[J]arsey Carolina New England.

I. N. Phelps Stokes Collection of American Historical Prints.

In North America, the term loyalist characterised colonists who rejected the American Revolution in favour of remaining within the British Empire. American loyalists included royal officials, Anglican clergymen, wealthy merchants with ties to London, demobilised British soldiers, and recent arrivals (especially from Scotland), as well as many ordinary colonists who were conservative by nature and/or felt that the protection of Britain was needed. Colonists with loyalist sympathies accounted for an estimated 15% to 20% of the white colonial population of the day, compared with those described as "Patriots", who accounted for about 40-50% of the population. This high level of political polarisation leads historians to argue that the American Revolution was as much a civil war as it was a war of independence from the British Crown.

In the 17th century, maps took a huge leap forward. Mathematical and astronomical knowledge necessary to make accurate measurements had evolved. English mathematicians had perfected triangulation: navigation and surveying by right-angled triangles. Triangulation allowed navigators to set accurate courses and produced accurate land surveys. Seamen learned to correct their compasses for declination and had determined the existence of annual compass variation. Latitude determination was greatly improved with the John Davis quadrant. The measurement of distance sailed at sea was improved by another English invention, the common log. Longitudinal distance between Europe and Québec was determined by solar and lunar eclipses by the Jesuit Bressani in the 1640s and by Jean Deshayes in 1686. With accurate surveys in Europe, the grid of the modern map began to take shape.