2. How did mechanization lead to the Dust Bowl? Gas powered tractors and harvesters increased erosion by damaging the soil.
Gas powered tractors and harvesters prevented water from penetrating the soil by thickening its winter coat.
Gas powered tractors and harvesters hardened the soil by repeatedly driving over it.
Gas powered tractors and harvesters produced a drought by release fumes into the atmosphere.

The first option is most likely what is being looked for.

>>>Gas powered tractors and harvesters increased erosion by damaging the soil.

The erosion here is wind erosion, not water runoff’s.

It is a little more complex than just the mechanization, it was also mismanagement of the ecology in the areas in Oklahoma, Kansas, etc

Mechanization allowed more and more fragile grassland to be broken for cash crops like wheat. Drought period set in, 1930’s
Crops failed, little natural grassland left to hold soil in place. Prairie winds whipped up dust clouds covering many states at times!!

Well since there aren't any choices i dont know if this is right but nationalism played an important role in the unification of both italy and germany i do believe