Final answer:
The Proclamation of 1763 primarily benefited Native Americans, as it aimed to mitigate conflicts by preventing European colonists from settling beyond the Appalachian Mountains.
Step-by-step explanation:
The group of people in the New World that benefited from the Proclamation of 1763 was Native Americans. The proclamation was issued by the British Crown and was intended to conciliate the indigenous peoples by checking the encroachment of settlers on their lands. This occurred after the French and Indian War, when European tensions and competition over North American territories were particularly high. The proclamation established a boundary, known as the Proclamation Line, which prohibited European colonists from settling beyond the Appalachian Mountains, thereby theoretically limiting the expansion of colonies and reducing the potential for future conflicts between settlers and indigenous populations.
European Colonists, especially those hungry for land, were frustrated by the Proclamation as it limited their ability to expand westward. Spanish Settlers and African Slaves were not directly affected by the Proclamation as it was a British policy that applied to British colonial territories; Spanish colonial policies and the conditions of slavery operated under different regulations.