With the exception of Native Americans, most people living in the US are either immigrants themselves in North America or the descendants of immigrants who have been arriving since the beginning of the 1600's. It is not surprising, therefore, that the US contains many different cultures and ethnic groups. How then can one talk about Americans? With great difficulty!
Below are some "generalizations" that may help you better understand the behavior you see and observe. Although generalizations can sometimes be helpful and applicable, they can also be inaccurate and harmful. The characteristics below vary significantly among various individuals, groups, and cultures in the US. Do not assume they describe all Americans.