Final answer:
The territorial changes that occurred between 1754 and 1763 were a result of the Seven Years' War.
Step-by-step explanation:
The territorial changes that occurred between 1754 and 1763 were primarily a result of the Seven Years' War, also known as the French and Indian War. Great Britain gained control of most of the French territory in North America, including Canada, after winning the war.
However, instead of allowing the American colonists to settle on the newly acquired land, the British government passed the Proclamation of 1763, which forbade colonists from purchasing land or settling west of the Appalachian Mountains. This was done in an attempt to prevent conflict with Native American tribes in the Ohio Valley.