According to one source the following were the countries of origin for new arrivals coming to the United States before 1790. The regions marked * were part of Great Britain. The ancestry of the 3.9 million population in 1790 has been estimated from various sources by sampling last names in the 1790 census and assigning them a country of origin. The Irish in the 1790 census were mostly Scots Irish. The French were mostly Huguenots. The total U.S. Catholic population in 1790 is estimated at 40,000 or 1.6%, perhaps a low count due to prejudice. The Native American Indian population inside territorial U.S. 1790 boundaries was less than 100,000.