Read the excerpt from "The Path of Our Sorrow" from Out of the Dust by Karen Hesse, and then answer the question that follows.
Then the war ended and before long,
Europe didn’t need our wheat anymore,
they could grow their own.
But we needed Europe’s money
to pay our mortgage,
our rent,
our bills.
We squeezed more cattle,
more sheep,
onto less land,
and they grazed down the stubble
till they reached root.
And the price of wheat kept dropping
so we had to grow more bushels
to make the same amount of money we made before,
to pay for all that equipment, all that land,
and the more sod we plowed up,
the drier things got,
because the water that used to collect there
under the grass,
biding its time,
keeping things alive through the dry spells
wasn’t there anymore.
Without the sod the water vanished,
the soil turned to dust.
Until the wind took it,
lifting it up and carrying it away
What are two causes of the Dust Bowl mentioned in the excerpt that you read about in other texts?