The United States and the Soviet Union
Answer
American pilots increased public awareness of the aircraft industry after World War I with public displays known as Barnstorming.
Explanation
Barnstorming was a form of performance American pilots performed to impress people with their skills and the sturdiness of the planes they used during the world war 1.
The pilots who flew these war planes around the country exhibiting stunt flying and parachuting are Barnstormers.
The answer is- environmental factors and food supply.
Answer:
iam pretty sure it is A
Explanation:
don't know if it is correct