Upstate New York treaties drawn up after the war ceded much of the land to settlers of European descent. It is largely rural with rugged terrain. The development of Upstate New York was spurred by the opening of the Erie Canal in 1825, which greatly eased the transport of goods between the port of New York City and inland cities along the Great Lakes. As a result, Upstate became a hotbed for manufacturing, giving birth to such firms as General Electric, IBM, Kodak, and Xerox, and it welcomed a large influx of immigrants. Since the mid 20th century, American de-industrialization has contributed to
Great Lakes some higher hills became Great Lakes islands. The Niagara Escarpment follows the contour of the Great Lakes between New York and Wisconsin. Land below the glaciers "rebounded" as it was uncovered. Since the glaciers covered some areas longer than others, this glacial rebound occurred at different rates. A notable modern phenomenon is the formation of ice volcanoes over the lakes during wintertime. Storm-generated waves carve the lakes' ice sheet and create conical mounds through the eruption of water and slush. The process is only well-documented in the Great Lakes, and has been credited with sparing the southern shorelines from worse