Learning about the people: "Hi!"

I´m definitely learning new things about the Americans every day. Among the first things I noticed when I had gotten off the plane in Minneapolis (and through immigration, thus freed from all my worries of sequestration) the day I arrived was the casual welcome from everybody. It's "Hi!". Not "Hello" or "Good morning"/"Good day"/"Good evening", but a quick "hi". That's all. I later realized that they'll bid you goodbye equally abruptly. They'll say "thank you, goodbye, have a nice day" faster than you can decipher the words and take notice of the fact that they're not into you anymore but moved on to another task. It´s a bit stressing, but the good thing is that even if you don´t keep up with them, it doesn´t mean a thing, and it will definitely not result in them taking offence. Good manners is not an issue here. Nobody cares. A mechanical "thank you" is the most anyone will expect of you and it doesn't even need to be followed by body language, i.e. you don´t need to look at or acknowledge the person even if you find reason to thank her. It´s expedious, uncomplicated and very efficient.

Hi! How are you nice to meet you thank you have a good day!