Ethnicity on the other hand is based in culture, where a person's ancestry developed, their national origin being foremost and then their learned culture and background over time becomes one's ethnic makeup. Examples of this are Hispanic, German, Scottish, English, Mexican, or Jewish. For instance I am White but also German, Irish and Dutch and through my family history there are cultural traditions carried on in each generation that have become part of my ethnicity and make me unique but also group me with people from my -specific ethnic background. Ethnicity means sharing cultural similarities such as language, cuisines, dress and traditions that are part of a national culture.
As far as the ways these concepts are important to the United States society, there are many, however not all of them are positive. These concepts are important to the United States society because people are recognized for the diversity of their race and culture as represented by each individual group. In my opinion race has been and is still used to determine power in our society and always brings separation by the ways in which it's distributed. Classes are formed and people are either lifted to a higher level of class based on their skin color or race of origin and others are suppressed and disallowed to climb higher in society by the same racial definitions. I believe the biggest importance in our society regarding both race and ethnicity is the way people are treated regarding healthcare and the glaring class