The U.S feared that if Japan conquered European colonies in Southeast Asia, it could threaten its control of the Philippines and Guam. As a result, the U.S sent aid to help the Chinese Resistance. Also, Roosevelt cut off supplies of oil to Japan
Douglass and the abolitionists argued that because the aim of the Civil War was to end slavery, African Americans should be allowed to engage in the fight for their freedom. Douglass publicized this view in his newspapers and several speeches.
Betty Friedan is your answer.
The answered to your question is rudder. The rudder is a fin-like object on the back of a ship. It allows the ship to not rely completely on the sails to change direction.
Systems of checks and balances?