Pls ! :

how does the us foreign policy affect issues within us ?

Foreign policy is mainly enforced by the President as you can see most of the time when he meets with other countries/allies.

Without foreign policy, we'd have bad relationships with our allied countries.

So foreign policy effects the stability of the relationships we have with the other countries of the world, through communication, money, trade, etc.

i dont know. sorry : (

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.