Passage: The British Judicial Committee of the Privy Council still serves as the highest court of appeal for several former colonies in the Caribbean and Pacific. British missionaries who travelled around the globe often in advance of soldiers and civil servants spread Protestantism (including Anglicanism) to all continents. The British Empire provided refuge for religiously persecuted continental Europeans for hundreds of years. British colonial architecture, such as in churches, railway stations and government buildings, can be seen in many cities that were once part of the British Empire.Individual and team sports developed in Britain—particularly golf, football, cricket, rugby, netball, lawn bowls, hockey and lawn tennis—were also exported. The British choice of system of measurement, the imperial system, continues to be used in some countries in various ways. The convention of driving on the left hand side of the road has been retained in much of the former empire.Political boundaries drawn by the British did not always reflect homogeneous ethnicities or religions, contributing to conflicts in formerly colonised areas. The British Empire was also responsible for large migrations of peoples. Millions left the British Isles, with the founding settler populations of the United States, Canada, Australia and New Zealand coming mainly from Britain and Ireland. Tensions remain between the white settler populations of these countries and their indigenous minorities, and between white settler minorities and indigenous majorities in South Africa and Zimbabwe. Settlers in Ireland from Great Britain have left their mark in the form of divided nationalist and unionist communities in Northern Ireland. Millions of people moved to and from British colonies, with large numbers of Indians emigrating to other parts of the empire, such as Malaysia and Fiji, and Chinese people to Malaysia, Singapore and the Caribbean. The demographics of Britain itself were changed after the Second World War owing to immigration to Britain from its...

Question: How many people migrated from the British Isles?
Millions