Separate and unequal.
I suspect that's the phrase you're looking for, even if you haven't provided us with a list of phrase choices. After the Civil War and prior to World War II, blacks in America had acquired a measure of civil rights, but they had not attained truly equal status with white Americans. And many "Jim Crow" laws, as they were called, compelled blacks to stay separated from whites in society.
The correct answer is - It enabled the Soviets to push the eastern front toward Germany.
After the Soviets won over the Germans in Stalingrad, the roles had switched, Germany was the one who was under attack, unlike previously when it was always the one that attacks the others.
The Soviets were gradually pushing the eastern front towards Germany, and the Germans were not very good at stopping them, first, because they were exhausted military and with supplies, and second, because the German army was built for attack, not for defense.
The Allies attacked Germany from the western side as well, and Germany found itself in the middle between multiple countries attacking it, so it eventually lost the war.
The protest that Rosa Parks ignited in 1957 was the Montgomery Bus Boycott. This started because of her refusal to give up her seat in the front of the bus to a white passenger.
France was heavily defeated in the Franco-Prussian War. Napoleon III was overthrown by a French rebellion. The circumstances leading to the war caused the southern German states to support Prussia. This alliance led to the unification of Germany.
