Nikita Khrushchev, Leonid Brezhnev, and Mikhail Gorbachev were ALL Soviet Leaders during the Cold War. The questions ask which One was NOT a Soviet Leader. President Richard Nixon was the 37th President of the UNITED STATES OF AMERICA. #ImATeacher
The increased migration and increased population that the United States saw during (any) era are examples of "<span>c. demographic and environmental changes," since these have to do mainly with population distribution. </span>
