Your topic is an excellent one, and you are correct to understand that if you want to talk about solutions, you need to first analyze the causes. For most complicated issues, there are many causes. I'd suggest that you list out the ones you find in your research and spend about one paragraph in your essay talking about all of the causes. Then, the next thing you need to do in trying to solve a problem (stop it) is to figure out which one of those causes is either easiest to solve, or the most important one to solve in order to make a difference in the problem. Additionally, you will want to consider which cause you can solve. For example, racism is obviously part of the problem but that is so wide ranging that it is hard to figure out a solution. However, you could target reducing racisim in a particular group, such as police or judges by some sort of education program. That is just an example and not necesarily what I think would be most effective. Do some research and you will find out the best ideas other people have.