The answer is Northern Plains I took it on my test.
It's the study of knowledge if that helps
The answer is C. Airplanes. All were used, but the other three were used as weapons.
George Creel headed the Committee on Public Information
during the time the U.S. joined the First World War. They used every method
within their disposal to convince Americans to support the war effort. They used printing posters, radio programs
and even the movies to convince public opinion that it was necessary for
America to take part in the war.
U.S. drive to spread democracy
