Answer:
The correct answer is "The American colonists began to move west".
Step-by-step explanation:
As part of the treaty of Easton, the British promised to prevent settlement on the land west of the Allegheny Mountains and leave them for the Native Americans members of the Iroquois Confederacy. However at the end the British failed to gave the lands to the Native Americans since the American colonists began to move west and it would be too challenging to regulate trade and taxes if Native Americans would occupied the land west of the Allegheny Mountains.