What are some obstacles which prevents third party candidates from winning elections?

Compared with the Democratic and Republican Parties, it’s difficult for third parties to gain meaningful or significant media coverage. This problem prevents Americans from learning more about third parties and their candidates.

Explanation:

This is the PLATO answer, so change it up a bit! :3

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries

they have different colored collars