Why is a launderette called a laundromat in the United States?

In the United States, the term "laundromat" combines "laundry" and "automat," reflecting its self-service nature where customers can wash and dry their clothes without staff assistance. This nomenclature emphasizes the automated, machine-driven aspect of the service, similar to how an automat offers food and drinks through machines. The term gained popularity in the mid-20th century as these facilities became more common.