What traces did the Great Glacier leave behind in North America?

The ice sheet has had a serious impact on the northern continents. In particular, the relief of North America has changed a lot. Scientists believe that the mass of ice on this continent even surpassed the modern sheet of Antarctica. The ice was so heavy that the crust of the continent was much lower than usual because of it. If you look at the map of this continent, you can see that the northern shores are heavily indented, and in the center there are many large and small lakes, and all this was formed under the influence of the ice sheet.