Think about it. Let’s start from scratch. How would you mount a campaign for President? The first thing you’d need is resources. How do you get resources? Well, perhaps people will help. How do you get people to help? You need an organization. So you build an organization. In America, we call that a party.
So everyone starts a party. There are hundreds, all fighting for one position. Is there a way to maximize your chances of getting that position? What if you ally your party with another one that shares a lot of your opinions and ideas?
Parties that merge become bigger and represent more people, and have a better chance of winning the position. But then, the other parties start doing the merging so as to maximize their chances.
What is the logical end of this? Everyone merges and merges until, in the end, there are how many parties?
You guessed it! Two.
Political theorists say that a mature democracy will end up with two parties. You can look at Canada and Britain and say they have three, but the theoreticians would say they are younger democracies than the US. They also might point to different rules. Some nations have proportional representation, not winner takes all. So in those nations, if some party gets ten percent of the votes, they get ten percent of the MPs.
But in the US, the winner takes all, and in winner take all systems, the best way to assure that you can win power is if you ally with 50% of the parties plus one. Since being in power is so important, most people are willing to make alliances instead of trying to go it alone. And since most voters want to vote for a winner, they will only vote for a party or a candidate who has a chance of winning.
There are only a few people who are willing to vote for a losing candidate on principle. And in some elections, those voters can have a huge, often disastrous effect. Like the time the Nader candidacy in Florida threw the election to Bush. Nader, not on purpose, brought us two disastrous wars. Oddly, he says that even if he had known, he still would have run.
Anyway, we end up with a two party system because we have a winner take all system. The two parties jostle to hold onto their fanatics while being just far enough into the center to get 50% plus one of the vote. That’s how you win elections. That’s why candidates go wing nut in the primary, when they have to appeal to the fans, and then make a turn to the center during the general election and they have to get 50% plus one of everyone.
We will never have multiple parties because if you aren’t the main party or one of two, you don’t have a chance. People value having power over taking a stand, for the most part. So voters will always only have a choice of two.