Dynastic cycles is linked to the Chinese idea of the Mandate of Heaven.
The Mongol invasions of Japan failed because Typhoon winds destroyed the Mongol fleet. The Mongols failed to conquer Japan even though they had successfully conquered the much larger land of China and also Korea. The typhoons that saved Japan did not even happen just once but twice ! Both times that the Mongols set out to conquer Japan, their fleets were destroyed by typhoons. Japan was geographically in luck and also helped by nature.
Brown v. Board made segregations in schools illegal.
This would make the answer B.
The 19th Amendment provided men and women with equal voting rights. The amendment states that the right of citizens to vote "shall not be denied or abridged by the United States or by any State on account of sex." It guaranteed women the constitutional right to vote. This amendment was necessary because the 15th amendment made it illegal for the federal or state government to deny any US citizen the right to vote. This amendment didn't include women, though. The 19th amendment changed this because it made it illegal for any citizen, regardless of gender, to be denied the right to vote. The movement to allow women the right to vote was the Suffrage movement. Susan B. Anthony and Elizabeth Cady Stanton were two major figures in this movement. They campaigned against any amendment that denied women the right to vote.
French involvement in the American Revolutionary War of 1775–1783 began in 1775, when France, a hotbed of various radical Enlightenment ideas and long-term historical rival of the Kingdom of Great Britain, secretly shipped supplies to the Continental Army when it was established in June 1775.
