Portugal was the first nation to find an all-water route to the East.

I'm not sure what your asking but that's true

Explanation:

Portugal was the first nation to find an all-water route to the East because the prince educated navigators in the needed skills. Prince Henry of Portugal was called "Henry the Navigator" because he supported navigation and exploration for his beloved Portugal.

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.