When was Hamburgers created?

Hamburgers' origin dates back to the late 19th century in Hamburg, Germany. The exact beginning and creator are subjects of various claims. Louis Lassen of New Haven, Connecticut, claimed to have sold the first 'Hamburger steak sandwich' at his lunch wagon in 1895. Another contender was Charlie Nagreen, who served 'hamburgers' at the 1885 Seymour Fair in Seymour, Wisconsin. It's challenging to pinpoint precise origins due to variations and similarities in 'Hamburg' steaks and 'Hamburg' sandwiches during that period.