Why did the colonies maintain these borders rather than expanding westward during this time period? A.
After the French and Indian War, the British issued the Proclamation of 1763, which prohibited colonists from settling on land West of the Appalachian Mountains.

B.
After the French and Indian War, the British lost most of their North American land to France, which included all land located west of the Appalachian Mountains.

C.
The British punished the colonists for the Boston Tea Party by passing the Intolerable Acts, which prohibited settlement west of the Appalachian Mountains.

D.
The British punished the colonists for the Boston Tea Party by passing the Stamp Act, which taxed the purchase of land west of the Appalachian Mountains.