According to "Katherine Johnson Biography," which event "marked a turning point" in the space race between the United States and the Soviet Union? Alan Shepard's mission

John Glenn's successful flight

the moon landing

the launch of Sputnik 1

Why did the south think that its secession from the union would succeed? a. the confederate army was larger than the union army. b. european nations had promised to support the south. c. the south only had to defend itself against the north, not defeat it.