Mississippi
Mississippi
The Mississippi River helped form the boundary between British and Spanish territory in 1763.
The Ohio river
The new border between British and Spanish territory in North America was established by the Treaty of Paris in 1763, following the conclusion of the French and Indian War. The treaty ceded Florida to Britain and recognized the Mississippi River as the boundary between British territories to the east and Spanish territories to the west. This division effectively marked the expansion of British influence in North America while placing Spanish holdings primarily in the region west of the Mississippi.
In 1763, the Treaty of Paris established new borders following the Seven Years' War, which resulted in Britain gaining control of Canada and Florida. The Mississippi River became a significant boundary, with Spain retaining territories west of it. Thus, the blank river in your question likely refers to the Mississippi River, which marked the border between British and Spanish lands in North America at that time.
Mississippi was the border to the British territory.
Florida was under British control from 1763 to 1783. It was under Spanish control until 1763, and it returned to Spanish control in 1783.
Boston
The proclamation was that you couldn't settle west of the Appalachian mountains, to prevent another war on the frontier with Native Americans.
the british nation
British lost much of its land in the east between 1763 and1783