Conversation so far:
What furs were being traded in the North American fur trade?
The earliest European trading for beaver pelts dated to the growing cod fishing industry that spread to the Grand Banks of the North Atlantic in the 16th century.
Who was trading in the North Atlantic in the 16th century during the North American fur trade?
The fisherman sought suitable harbors with ample lumber to dry large quantities of cod. This generated their earliest contact with local Aboriginal peoples, with whom the fisherman began simple trading.
What were the 16th century fishermen trading for the skins during the North American fur trade?
The fishermen traded metal items for beaver robes made of sewn-together, native-tanned, beaver pelts.
Were there any disagreements between the fishermen and Aboriginal peoples in the 16th century during the North American fur trade?
During the 1640s and 1650s, the Beaver Wars initiated by the Iroquois forced a massive demographic shift as their western neighbors fled the violence.

Question: Why did the war start?
Self-contained rewrite: Why did the Beaver Wars start?