Racial Stratification is the thought that society is separated based race. That people of similar color for example; Black, White, Hispanic, Asian are stratified by race. It has nothing to do with biological similarities. It has to do with the race that you are born into. We classify people based on perceived differences. This is how we determine upper class and minorities.
Minorities are not necessarily a group of people that has the least amount of people. It is however, it is a group of people that lack the most power with in a social stratification. The dominant group holds the most social status, power and prestige. Groups with smaller numbers and less status are set up for discrimination and prejudice. This is how racism comes about. This racial stratification carries over into law, education, economy, healthcare and politics.
We have seen this example with racial profiling. There are many examples of it still in today’s society. Just because you are of a color there may be many preset judgments against you. The links below give a few examples of how racial profiling still exists.
http://www.npr.org/2011/02/18/133848837/segregation-in-america-dragging-on-and-on