Which act aimed to provide public financing for presidential elections?

The Federal Election Campaign Act (FECA) is the correct answer as it was specifically designed to regulate campaign financing for federal elections, including presidential elections. Enacted in 1971 and amended several times, FECA aimed to increase transparency in campaign finance by imposing limits on contributions and mandating the disclosure of campaign finances. A key aspect of the act was the establishment of a system for public funding of presidential campaigns. Candidates who agreed to abide by certain spending limits could access federal funds, helping to level the playing field among candidates and reduce the influence of wealthy donors on the electoral process. This public financing component is a hallmark of FECA and is critical for understanding campaign financing in the United States.

Other acts mentioned primarily addressed different aspects of campaign finance but did not establish a public financing system to the extent that FECA did.