Q: Why does the US have just one party more than China? A. Access barriers to ballots and debates? B. Big Money in politics? C. Collusion between the two major parties? D. Duverger's Law? All of the above may be true, but the root cause of the two-party system is Duverger’s Law. Nowhere does the US Constitution say we must have a two-party system—two dominant parties result from our primitive choose-one plurality voting method. Similar candidates would split the vote, so parties consolidate...