Why Are Hot Dogs Called Hot Dogs? The Unique History Of This American Sausage - Tasting Table
Briefly

The article outlines the historical origins of the hot dog, tracing it back to German immigrants who brought sausages, known as dachshund sausages, to America in the mid-19th century. Although the exact naming of the hot dog remains uncertain, it gained popularity in the U.S., where it was initially sold without buns. The term 'hot dog' is thought to have emerged around 1895 in connection with jokes about German sausages, with a cartoonist's portrayal in 1901 potentially cementing the name in American culture.
In 1901, New York Journal cartoonist Tad Dorgan heard vendors selling 'red hot' dachshund sausages at a polo match, which may have led to the term 'hot dog'.
By the 1850s, approximately one million Germans immigrated to the U.S., bringing with them dachshund sausages, which started to be sold from pushcarts.
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