The Wisconsin Glaciation was the last major advance of ice during the last Ice Age, occurring approximately 85,000 to 11,000 years ago. It primarily affected parts of North America, including the northern United States and Canada. This glaciation was characterized by the expansion of the Laurentide Ice Sheet, which shaped the landscape, created lakes, and deposited sediments as it moved. As the climate warmed, the ice began to retreat, leading to significant ecological changes. The melting glaciers contributed to the formation of many natural features, such as the Great Lakes. The Wisconsin Glaciation played a crucial role in shaping the environment and ecosystems we see today.