A - The defeat of the confederate infantry at Pickett’s charge
Although Lee’s army enjoyed early success, Meade's army managed to hold ground and even break back the Confederates. As the Union held its ground and pushed back the Confederates, they suffered major losses
The articles of confederation was drafted after the revolutionary war. But later on this would also create issues since the power was given to states and not to the Federal government.
The main reason the Supreme Court ruled in favor of the civil rights activists by using the Constitution as their reasoning. They concluded that both the 13th and 14th amendment didn't give Congress the right and/or power to regulate affairs of individuals and/or businesses.
Hope this helps
In World War 2 it was Stalin and World War 1 it was Lenin.