Mississippi River
This depends entirely on when and what area of the world we are talking about. The English Channel (la Manche) forms a physical boundary between English and French territory in Europe after the Hundred Years War with England being north of the channel and France being south of it. In North America, prior to the Seven Years War, the Appalachian Mountains separated the English colonies and the French colonies with the English colonies being to the east of the mountains and the French colonies to the west. French Indochina and British Burma were separated by the Mekong River with British Burma lying to west and French Indochina lying to the east.
Mississippi River
The Westward Expansion was when the US gained more territory west of the original 13 colonies.
The Appalachian mountains.
They didn't trade anything. Slaves were brought from Africa to the West Indies
The original British colonies were east of the Appalachians. In fact, in the late 1750s, a law was passed that prohibited any settling beyond the Appalachians, even though the colonies extended beyond.
Colonize the territory of California.
All of the original colonies were English, and there were thirteen. I am not sure what all of them are, but they include New York, Pennsylvania, Virginia, New Jersey, Rhode Island, North & South Carolina, West Virginia, and Georgia.
France. It was called Louisiana after their king Louis XIV.
It is the Appalachian mountains.
The Bolshevik territory in 1919 extended from Petrograd in the north to the Black Sea in the south, and from the Volga River in the east to Belarus in the west. The Civil War in Russia during this time meant that the Bolsheviks were constantly expanding and defending their territory from counter-revolutionary forces.
The territory that bordered the British North American colonies to the north and west was New France, which primarily included areas that are now part of Canada. Specifically, the regions of Quebec and Ontario were significant parts of New France, extending further westward into the territories of the Great Lakes and the Mississippi River Valley. This expanse of land created a buffer between the British colonies and the indigenous territories as well.