one of two major mountain chains in the eastern United States and Canada, extending 1,600 miles from Newfoundland south to Alabama.
a major mountain system of the United States and Canada, extending 3,000 miles from Alaska south to New Mexico.
the line of the highest points in North America that marks the separation between rivers flowing eastward and westward.
St. Lawrence Seaway
North America 's most important deep-water ship route; completed in the 1950's as a joint project of the United States and Canada. (The seaway connects the Great Lakes to the Atlantic Ocean by way of the St. Lawrence River).
: a section of a waterway with closed gates where water levels are raised or lowered, through which ships pass.
a major river that runs north-south almost the length of the United States, from Minnesota to the Gulf of Mexico, and is part of the longest river system on the continent.
the movement of plants, animals, and diseases between the Eastern and Western hemispheres during the age of exploration
any kind of economic activity that produces a service rather than a product.
a region in which several large cities and surrounding areas grow together.
a functional area including a city and its surrounding suburbs and exurbs, linked economically.
a government in which the people rule through elected representatives.
a person of mixed French-Canadian and Native American ancestry