I believe the answer is Barbed Wire.
Befor the inventions of barbed wire, the Cattles are let to roam freely across the plains and the owners are required to pay a lot of cowboys to supervise them so they didn't go missing. Witht he invention of barbed wire, they can keep the cattle in a secure place without supervision.
The Agricultural Adjustment Act (AAA) was part of Franklin D. Roosevelt's "New Deal" policies, which were supposed to help lift America out of the Great Depression. This specific act focuses on helping farmers by reducing the amount of surpluses.
When there is a surplus of goods, the price of the good drops. This is because there are not enough people buying them. To stop this, FDR paid farmers not to grow any more crops. Farmers not going crops resulted in two positive outcomes:
a) Reduced amount of surplus.
b) Increased demand for goods/products.
This resulted in Georgian farmers being paid more for the goods they produced, helping them financially.
