Friendship in America

Some reasons that Americans are perceived this way is because Americans are friendly at first , very friendly, because they care about their ego and what people think  about them , so once they think you like them  they don't need to grow the friendship. Also Amercans like to be independent, and just because they are independent  doesn't mean they aren't friends it just means thet don't spend as much time  with friends  for every little thing. Also Americans move and change a lot so their so their friendships change, and they never have time to grow their friendships, so it seems they don't value friendship.