What is the name of the dark line shown on this map? who created this line?

the name is the Proclomation line of 1763, created by the British at the end of the French and Indian War to appease Native Americans by checking the encroachment of European settlers on their lands.

Explanation:

It created a boundary, known as the proclamation line, separating the British colonies. The Proclamation Act of 1763 restricted the freedom of the colonists to: trade with other nations levy their own taxes travel at will from town to town settle anywhere other than the land along the Atlantic Coast. The Proclamation Act of 1763 restricted the freedom of the colonists to: settle anywhere other than the land along the Atlantic Coast.

where's the