Uncle Sam turning his back to Europe in the 1930s conveyed that Americans were not going to be allies with anyone unless they shared the views of the American people.
Uncle Sam's turning back on Euorpe in the late 1930s is the attitude of the United States at a time of great depression, which has resulted in the strengthening of totalitarianism in Europe led by Germany. Many problems arise as a consequence, and the attitude of America on this occasion is isolationist, and turning back by Uncle Sam shows that America will not participate in such views.
