Map/List of countries that gained independence from Great Britain along with the years:
https://upload.wikimedia.org/wikipedia/commons/7/74/List_of_countries_gained_independance_from_the_UK_Flag_version_3.svg

The big areas absent areas are:

• South/Central America where they speak Spanish and Portuguese as they were colonized by them
• North Asia / Former USSR territories
• Greenland - colonized by Denmark