After the revolutionary war what was the borders for the united states on the north south and west

purchase of the Louisiana Territory

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Explanation:

At the end of the Revolutionary War, people considered the Mississippi River as the western border of the United States. After the purchase of the Louisiana Territory by Thomas Jefferson in 1803, these ideas began to change.

where the answer is.

After the purchase of the Louisiana Territory by Thomas Jefferson in 1803, these ideas began to change.

1.d 2.a c.!

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.