How has US foreign policy impacted Africa, Asia, the Caribbean, Latin America and the Middle East

The U.S.'s foreign policy after WWI was to become isolationists. They said they would not supply any country with weapons.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.