The United States elections are the most famous in the world. The presidential campaign is one of the longest, starting more than a year before the elections. Elections in 2016 were considered dirty, since Donald Trump and Hilary Clinton sought to completely discredit each other. The diploma thesis introduces answers to two research questions that were occurring throughout the thesis. The first question is whether the media properly and realistically introduced both candidates for the 2016 elections. And the other question is, whether the social media had a major influence on the victory of Donald Trump. First part of the thesis presents the American political system, the media, and the election campaign in general. Second part describes the actual impact of the media on the elections and the election campaign. Both candidates and comparison of campaigns are presented, as well as the results. In the last part, a comparison of the social media impact in years 2008 and 2016 is given. The end of the thesis presents conclusion and findings on the research questions.