According to the Americans, we've just went through the Sputnik Crisis of our age. Imagine teaching your kids about events of last weekend.But as it wafted through US skies before being shot down Saturday off of the Carolinas, the balloon created a sudden moment when the idea of a threat by China to the US homeland was neither distant, theoretical, unseen, or years in the future. And it underscored how in today’s polarized America, Washington’s first reaction in the face of a threat is to point fingers rather than unify.