Important Supreme Court Case from 1920-2014

What impact did specific Supreme Court decisions have on American society between 1920-2014? Briefly discuss background on Three to Four specific cases and analyze the impact these cases had on the economy, politics, and social/race relations. Which Supreme Court Case do you believe had the biggest impact on American society between 1920-2014? Why? Material for this question can be found at internet sites that provide a summary and analyses of the cases.
Support your opinion with persuasive evidence from outside sources and websites.
Cite any direct quotes or outside material used.  For outside sources you must cite in Bibliography at end of paper.  Underline your thesis-main argument. You need to have an Introduction, thesis statement, coherent/logical paragraphs, persuasive evidence and a conclusion.