History: Britain’s Futile Attempt to Keep American Colonists From Taking Tribal Land

A Unique Moment in American Mapmaking

In
a futile attempt to keep American colonists from taking tribal land,
British surveyors and Native American leaders drew a border along the
Appalachian Mountains. Then the Revolutionary War happened.

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In the 1760s, the government in Britain was taking a new approach to its
vast colonial holdings, and in 1763, colonial governors and tribal
leaders met in Fort Augusta, Georgia, for the first of 10 congresses at
which they negotiated a geographic separation. The king had ordered that
there should be a limit to colonial expansion—if a tribe claimed a
stretch of land, a colonial governor was not supposed to grant it to
settlers. The Fort Augusta meeting began with the tribal representatives
describing what they believed to be the extent of their territory. Over
the course of several congresses, the diplomats agreed on a boundary
between tribal lands and the seaboard colonies. This negotiated line was
supposed to limit conflict for the foreseeable future.

LINK 

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Royal Proclamation of 1763 (wiki)

The
Royal Proclamation of 1763 was issued October 7, 1763, by King George
III following Great Britain's acquisition of French territory in North
America after the end of the French and Indian War/Seven Years' War,
which forbade all settlement past a line drawn along the Appalachian