Answer:
To keep away other forces and was great for keeping invaders put
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It was groundbreaking because it was funny and educational and approached modern topics in a way that was accessible to children, yet it wasn't offending anyone. It was one of the first show whose educational effects on children were studied and it is considered to be a very positive show and a good thing to watch. The long term impact is that it created a legacy of a hundred million people watching the show in their lifetime, usually when children.
Confederate army won the battle of chickamauga by spreading the false information that Confederate General Braxton Bragg was retreating. This false information drove the Union Army of the Cumberland back into Chattanooga, Tennessee, from Chickamauga Creek where, after days of battle, Confederates were victorious.
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.