I think America just made it up as the went along when the settlers first invaded what became known as America the level of literacy was far less than it is now. Spellings were changed and some words too.
Some words just never made sense of course like the English popular food of Faggots became a slang term for something else.
Faggots are meatballs made from minced off-cuts and offal, especially pork (traditionally pig’s heart, liver, and fatty belly meat or bacon) together with herbs for flavouring and sometimes added bread crumbs. It is a traditional dish in the United Kingdom
Fag in Europe would more than likely be a term for a cigarette
The English language contains some 300000 words most are never used , A good vocabulary might be 30k or so an English graduate may be in the region of 65k so most words are archaic . New words are also added every year as the language is still constantly evolving. There are also lots of regional differences, Scotland for instance has its own version of English and many words that are only really used here. Glaikit – Stupid, slow on the uptake Drookit – Soaking wet They say that in Gaelic there are 23 words for the type of rain (not a surprise) but not English of course