Most of America's immigrants prior to the Revolutionary War were from Great Britain and included the: Welsh English Scotch Belgians Germans

Welsh English Scotch

Explanation:

Most of immigrants to America before the Revolutionary War were from the Island of Great Britain.

The majority of them were from England, for example, in the Northeast, many of them came from the East of England, representing regions such as East Anglia, while in the Tidewater region, most came from the Southwest.

There were also many people from Scotland (Scotch) who mostly settled in Appalachia, and also Welsh, who settled all over the country.