Something is going on with American teenagers. A decades-long survey of 12th graders asked teens about their ideal number of children. For most of the survey’s history, left-leaning and right-leaning teens reported wanting kids at similar rates. But in recent years, teens who identify as “liberal” or “very liberal” have become less certain, increasingly responding that “zero” is their ideal. Data from this decade show that just 67% of liberal-identifying teens say they want at least one child, compared to 90% of their conservative peers.