If two Americans meet because they collide or crash into each other they have a big chance of arguing, if the crash is not much serious, but this would happen to any nationality. If two Americans meet because they date the same woman, each not knowing of the other, they have a good chance of talking about the woman, and also about each other in unpleasant ways for the occasional passer-by. The same for people from many other nations. If two Americans meet in a train as coworkers in the train, they will talk about their tasks, and the talk would be quite terse, or maybe just a brief 'good morning', and silence The list is getting too long, I did not suspect about all these possibilities, sorry, I must stop here, the total number of possibilities is over 9 followed by 16 zeroes, but you will find many similarities in those possible dialogues, nevertheless the set of (more or less) unique dialogues would still be very, very large, and this is also due to the big variety of humanity that, for historical reasons, the American Nation has inside itself, and for the fact that free speech is allowed in that Nation (you are referring to the USA, I believe) , usually without fear. What I fear is the moment when two people meet and their subject of conversation would have a good chance to be about TV programs; that could be a sign that (unless serious countermeasures are put into effect) a rapid decline for that nation has already started.

Americans usually introduce themselves by name, talk about which state/city they live in and then what job they have. They do not ask personal questions about weight, age, family background or religious beliefs.

Religion and politics are a NO NO NO!!!

LOL.

what's up sounds about right. lol Never talk about politics or money when you don't know someone well. You could start an arguement and/or sound very superficial. Talk about things you like to do in your free time. That makes you interesting and if you ask others what they like that makes you even more interesting. :)