The impact that best completes the diagram on international competition and mechanization of American farms is D Tariffs on foreign food commodities increase significantly.
How did the U.S. respond to international competition in the 1920s?
When U.S. farms began producing more goods thanks to mechanization, they still came under intense international competition which led to a fall in prices.
This led to the U.S. government instituting tariffs on foreign food to help the farmers who were now in so much debt that many farms had been lost.
Find out more on U.S. tariffs on food commodities at https://brainly.com/question/3001855
#SPJ1
