The correct answer is C) They were not legally allowed to settle to the east of the line.
This map shows the Proclamation Line of 1763, which was created after the end of the French and Indian War. The colonists were offended by the Proclamation Line because they were not legally allowed to settle to the east of the line.
The American colonists were upset by this decision made by the British government and of course, many Americans did not follow this rule and this caused many conflicts with the English. A series of conflicts and differences due to the heavy taxation imposed by the English crown and the fact that the American colonists did not have voice or representation is the British Parliament were major causes of the American Revolutionary War.
Because the war in Europe was in a lot of Allied countries, for example France. They wanted to focus on the enemies that were at their front door first and posed the most imminent threat over Japan which was on the other side of the globe.
One of them is the " nation was forced to give up its lands east of the Mississippi River and to migrate to an area in present-day Oklahoma. The Cherokee people called this journey the "Trail of Tears," because of its devastating effects."