Feudalism helps the reducing of a level of inequality in many European nations because it generates a tradition of state paternalism, which set the time for the modern welfare state. Feudalism rises the perfect monarchies. Feudalism helped to stabilize European society.
The contributions of African Americans for the Union war effort in the Civil War pushed the federal government, controlled largely by the republican party, to exchange the course of action and affected the consequences which included but were not limited to the amendment of the constitution to give certain rights to african americans.
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Convinced the French to fully support the Americans in the fight against the British. The French proved to be valuable allies as they provided military troops, supplies, etc.