The document summarizes campaign finance history in the United States from the 1970s to present. It discusses key court cases and acts that have shaped how money influences politics over time. Citizens United vs FEC is highlighted as a pivotal 2010 Supreme Court decision that allowed unlimited spending by corporations and unions in elections, fueling a rise in "dark money" groups spending undisclosed amounts. Tables provide an overview of campaign contributions and spending for recent election cycles, demonstrating a growing role for unlimited outside spending groups.