I'm afraid we've been bamboozled
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The US wanted to rid itself of as much English influence as possible, she even changed the spelling. Odd that she held on to Imperial.
Imperial is slightly different. We use US customary measures.
This is one of my favorite facts.
*French influence. Most of the prominent differences between American and British English (such as -er/-re and -or/-our) occurred because the British preserved (or changed spellings to add) French influence.