Essentially, the British calling football "football" while Americans use "soccer" is a transatlantic linguistic disagreement.
In their book "It’s Football, Not Soccer (And Vice Versa)", Stefan Szymanski and Silke-Maria Weineck write: "Transatlantic relations remain calm when discussing sweaters and jumpers, trucks and lorries, trunks and boots, or pants and trousers. Americans marvel at British quaintness, while the British cheerfully mock Americans for not grasping basic vocabulary. Everyone is content, until 'soccer' comes up".
Despite being a distinctly American term, also used in Australia, Canada, and other countries where rugby or gridiron football dominates the sporting landscape, "soccer" actually originated in England around the 1800s.
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