The first hamburger was German. It was named after the German town Hamburg.
In the 19th century a lot of immigrants went to the USA from Hamburg. It was a long journey by ship. One day they made a sandwich with bread and meat. People called it “Hamburg steak”.
In the USA these immigrants worked very hard. Sometimes they stopped for a quick snack. They put meat between a roll of bread. This snack became very popular and people called it “hamburger”.
Then, in 1920s, new “hamburger” opened. The first was the White Castle and then McDonald’s opened in 1940.
Soon everyone was eating hamburgers, not only in the United States, but in over 40 countries all over the world.
Now there are cheeseburgers, baconburgers, chickenburgers, fishburgers, veggieburgers, and beefburgers.