However , over-trapping forced tribes to move west to find suitable forest areas .
Additionally , as the Hudson 's Bay Company moved into the prairies , the fur trade offered an extremely important source of income and goods for the Cree .
Over-trapping forced tribes to move west to find suitable forest areas .
Additionally , as the Hudson 's Bay Company moved into the prairies , the fur trade offered an extremely important source of income and goods for the Cree .