No, it’s actually not true. First-past-the-post voting mathematically tends to result in 2 dominant parties, but there’s no mathematical rule that determines which 2 parties. The first two in American history were the Federalist Party, and the Democratic Republican Party. The duopoly has changed several times over the years, and it could change again if we wanted it. Democratic voters have affirmatively made the choice that supporting genocide is better (read: easier) than trying to shake things up.
Don’t they have a point though? Your system is broken and the lesser of two evils is all you ever get to pick.
No, it’s actually not true. First-past-the-post voting mathematically tends to result in 2 dominant parties, but there’s no mathematical rule that determines which 2 parties. The first two in American history were the Federalist Party, and the Democratic Republican Party. The duopoly has changed several times over the years, and it could change again if we wanted it. Democratic voters have affirmatively made the choice that supporting genocide is better (read: easier) than trying to shake things up.