What did the Dust Bowl teach us?

Besides the introduction of advanced farming machinery, crops were bio-engineered; through hybridization and cross-breeding, development in crops were made that allowed them to be more drought-resistant, grow with less water, and on land in locations where water resources were scarcer.

for the united states of america, 1945 to 1964 was a time of high economic growth and general prosperity. it was also a time of confrontation as the capitalist united states and its allies politically opposed the soviet union and other communist countries; the cold war had begun.

explanation:

d.)   when the us left nato after the end of the cold war and they had to evolve to focus on more humanitarian measures with the smaller budget