Our history is defined by the youthful push to make America more just, more compassionate, more equal under the law. This generation—of Parkland, of Dreamers, of Black Lives Matter—embraces that duty. If they make their elders uncomfortable, that’s how it should be. Our kids now show us what we’ve told them America is all about, even if we haven’t always believed it ourselves: that our future isn’t written for us, but by us.