How is the humble plow, one of the most important inventions in history, is important to farmers?

it turns the top soil and any remaing crop over, producing fertilizer.
it breaks up the soil for easier planting.
it plants the next crop.
it is easy for small animals or children to maneuver, to not take the farmer's time.
by turning over the soil, weeds are reduced

by creating a labor shortage that pushed the continent toward a market economy

i do not know if this question has options, but a main impact of the federal reserve act of 1913, which created the federal reserve bank, was the international use of the u.s. dollar, which soon became the world's leading currency - particularly during world war i, since many nations around the world asked the united states for money.