The country famous for inventing the hamburger is the United States. While the exact origins of the hamburger are debated, it gained popularity in the U.S. in the late 19th and early 20th centuries. One theory links its creation to German immigrants who brought the concept of the "Hamburg steak" to America, which was then adapted by placing it between two buns. The hamburger quickly became a staple of American cuisine, especially popularized by fast-food chains. Today, it's enjoyed worldwide, with numerous variations and styles reflecting global tastes.