What did Hollywood, universities, car manufacturers, and other places of business do to potential employees? A) Imposed political tests on them for hiring purposes.
B) Imposed religious tests on them for hiring purposes.
C) Imposed health tests on them for hiring purposes.

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.

europeans carried a hidden enemy to the indians: new diseases. native peoples of america had no immunity to the diseases that european explorers and colonists brought with them. diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to american indians

so the soldiers could have water when needed for wounds or drinking, and it will also be easy to set up camp if it does not flood.