Why did the King of England make the pronouncement of the "Proclamation Line of 1763?

Proclamation Line of 1763 was meant to stabilize relations with native North Americans.

Explanation:

The 1763 Proclamation Line was a British measure following the French and Indian War by declaring the boundary of the Eastern Continental Divide in the Appalachian Mountains which prevented Anglo-American colonists from western expansion. It was a protective measure to avoid conflict with the native Indian tribes and french colonists which could have lead to another expensive war. Moreover, the British Government expressed concern that western expansion would provide opportunities for colonies to gain economic independence.

explanation:

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the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.