What's the features of "melting pot" culture in the United States?

美国的“大熔炉”文化有何特征?
American culture is unique because it is nurtured,formed and developed under certain conditions,which are characteristically American.The major factors contributing to the making of this new nation and the forming of a new culture are the hard environment,ethnic diversity and plural religion,which is quite different from other nations in the world.What is more,these elements are still influencing the American culture.