Aspecific failure of reconstruction was that

Jim Crow laws

Explanation:

Although there are many elements of Reconstruction that have been considered a failure, a specific example was the passage of Jim Crow laws in the South.

Jim Crow laws were state and local laws that enforced racial segregation. These laws remained in place until 1965, and they made it impossible for African Americans to achieve full legal, political and social equality.

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.