P.S. I've always been a fan of the cosmopolitan two l's in "traveller". I hope that doesn't get Americanized.
Differences between US and UK English are strange, but often insignificant (apart expressions, slang and urban language). Americans tend to simplify, and write the way they speak. As a French, I learned UK English as a student, but with time, TV series, RPG books, internet, media and stuff like that, I tend to write more and more in US English (Color/Colour, Analyze/Analyse, Center/Centre, etc.), but there's always a few words that defy logic.
Travel is a typical exemple :
Traveler (US) / Traveller (UK) - but Enrolment (uk) / Enrollment (us) : what ?
And when we address the Imperial system, compared to pure logic beauty of the Metric system, we (much of the world, but especially the French) think that English are crazy. They like it hurts.