Answer:
In America, "third parties" are those political parties that are not part of the country's two major political parties, the Democratic Party and the Republican Party. Some examples are the Green Party, the Libertarian Party or the Constitution Party.
Given the bipartisan system that the nation has, third parties have practically no chance of accessing government positions, except in the case of local governments, where they sometimes access minor positions.
Therefore, these political parties usually do not have hopes of accessing the presidency, governorships or even Congress, but on the contrary, their nominations are motivated to install debate topics in American society, "taking away" votes from the closest majority party to its ideals, or to influence politicians of the majority parties to adopt some of their ideas.
