Pratanu Banerjee
Upset indicates depression.
Angry is high level of emotion.
I think they are opposite.
robert2020
To your question. Yes. It can be used in American English.
But they don't really mean the same thing. Upset, just ,means this is disturbing.
quatt47
Not really. To be upset is to feel sad whereas anger is an emotion generated by the actions of others which are perceived as bad.
wind_updoll
It’s a broader term, where angry defines the upset.
Anonymous
Yes it means pretty much the same thing.