Why Do Americans Call It Soccer Instead of Football? Blame England
In the World Cup, the U.S. and England arent traditionally rivals. But, off the field, a different type of rivalry has reigned for more than a century: what to call the worlds most popular sport.
To Americans, its soccer. To most of the rest of the world, (including England, the birthplace of the modern sport,) its football. But what most people dont know is that the word soccer is not in fact an American invention. On the contrary, it was an import from England, and one that was commonly used there until relatively recently.
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In the early 1800s in England, football and rugby existed as different variations of the same game. But in 1863, the Football Association was formed to codify the rules of football so that aristocratic boys from different schools could play against one another. In 1871, the Rugby Football Union followed suit. The two sports officially became known as Rugby Football and Association Football. (Those new rules were slow to spread to America, where another version of the game was evolving one that the rest of the world now knows as American football, and is played in the NFL.)
In England, Szymanski writes, aristocratic boys came up with the shortened terms rugger and soccer to differentiate between Rugby Football and Association Football. To support this argument, he cites a letter to The New York Times, published in 1905: It was a fad at Oxford and Cambridge to use er at the end of many words, such as foot-er, sport-er, and as Association did not take an er easily, it was, and is, sometimes spoken of as Soccer.
https://time.com/5335799/soccer-word-origin-england/
Of course it would be too much for Donny boy to do a little research.