Your question suggests they were man-made. But they are natural features made by the normal processes of land weathering and movement.
No they are not.
Glaciers from the last ace age formed the Great Lakes as well as many of the North American lakes.
The Northwest Territory is made out of the region south of the Great Lakes , north and west of the Ohio River
none of the great lakes are man made all of them were made from nature
Michigan is divided into north and south divided by the Great Lakes.
The Great Lakes are a natural feature.
Your question does not specify what time period you are referring to. I will assume you are asking about the colonial period of Canada's history. Therefore, the answer is: the land north of the Great Lakes was controlled by Britain, since Canada was one of her colonies. The area north of the Great Lakes was at that time part of the the colony of Upper Canada (After 1840 called Canada West). This colony was made up mostly of English-Canadians and American Loyalists.
they made by glaciers melting
melted glaciers
The Great Lakes are estimated to have been formed at the end of the last ice age (about 10,000 years ago).
The Great Lakes are a natural feature.
North Carolina has no natural lakes. They are all man made.