[euroderf]

American calendar weeks begin on Sunday in order to break up free time as a concept - and make work front & center. Oh how obnoxious & boring.

[leipert]

I think it’s because the Jewish (and therefore the Christian) week traditionally starts on Sunday.

That being said, I like having the week start on Sunday (despite Germany starting weeks on Mondays) because I can just open the calendar app on Sunday night and see if I have any appointments early on Monday morning without switching weeks.