Chocolate manufacture started in the early 1900’s. Milton Hershey started the town of Hershey in Pennsylvania because he wanted to address Quaker societal concerns. The Hersey kiss was brought into the world in 1907. Frank Mars formed Mars in Chicago, 1922. Frank had a son that invented the Mars bar in England, and when he moved back he worked with Bruce Murray to create M&M’s with the companyM&M Ltd.
Chicago became the center of the US candy industry, and so many other companies started there as well.