There are two main implications of Jim Crow laws.
First, the fact that Jim Crow laws existed and were legal shows that the American system of justice does not always work the way that it should. Jim Crow laws were laws that created a stringent system of segregation of African Americans and white people. These laws were in effect in the South from the later parts of the 19th century until the 1950s and 1960s. They were meant to keep African Americans from enjoying equal rights and equal status in our society. These laws were declared constitutional by the Supreme Court. This clearly shows that our system does not always provide just results.
Second, Jim Crow laws continue to have implications today. They strongly affect our current race relations and some of our societal problems. Jim Crow laws helped to create the situation in which African Americans are, on average, less well-off than other Americans. This is a major social problem for us today. They also helped to maintain and create a situation in which there is a great deal of tension between African Americans and whites today.