Before revision: is believed to stretch back to the arrival of the earliest people over the Bering Strait, or alternately along a now-submerged coastal plain , through the development of significant pre-Columbian cultures and population densities, to the arrival of the European explorers and colonizers.
After revision: is believed to stretch back to the arrival of the earliest people over the Bering Strait, or alternately along the ice free coastal islands of British Columbia (See , through the development of significant pre-Columbian cultures and population densities, to the arrival of the European explorers and colonizers.