Do We Need More Parties?

I mean political parties. It strikes me that we in the good old U.S of A might be suffering from a lack of viable political parties, beyond the minimum of two required of a democracy. I don't have the facts at my fingertips at the moment, but I suspect that the U.S. may be the only democratic government in the world that has only two viable parties to choose from. I've noticed that in other democracies, with three or more parties, alliances are typically necessary "to form governments," meaning, "to get anything done." And shifting alliances seem to make these other systems vibrant and adaptive, whereas our two parties, always at loggerheads, can't seem to get anything done. If we had a sizable third party, they could sometimes choose to side with the Republicans, sometimes with the Democrats, both of which would have to appeal to this third party to get their support. Things would get done. Wouldn't this be better?

I'm just asking.