Why does the United States have only two major parties? A. The Constitution prohibits minor parties. B. The first-past-the-post electoral system. C. State laws forbid minor parties. D. Two parties represent all the choices voters need

Well, there's a two party system because if a party cannot win an election, then it can't control anything of the government. That's why only two political parties because people would go for one major party, to the disadvantage of the other parties. The answer would be D.