What did henry ford do in the roaring 20s

There are a lot more things that he did in the 20s but I just gave you one.

He introduced the Model T automobile as an owner of the Ford Motor Company. He became the richest and best known man in the world at that time. He produced many cars that were not so expensive using the assembly line. His workers got paid way more than anybody else. His famous invention of the car cost $850 which was a reasonable price for back then. 

Henry Ford (1863-1947) was one of America's greatest businessmen, the founder of Ford Motor Company and the man largely responsible for initiating the era of mass-consumption and mass-production in the American economy. Ford's innovative business practices, including standardization, the assembly line, and high wages for workers, revolutionized American industry.

Democracy and darwinism would be my answer.