7. What was the purpose of the Central Intelligence Agency (CIA) and the National Security
Council (NSC)?

The NSC was one of several creations of the National Security Act of 1947, which also established the Central Intelligence Agency and placed the armed forces under the Secretary of Defense.

Explanation:

The Act gave the NSC congressional mandate to coordinate U.S. foreign and defense policy.

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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.

i believe the answer is bartolomeo dias