they didn't you fucking retard. you're thinking of icbms, which reach high speed skimming the atmosphere in low orbit making them vulnerable to interception.   you extra double nigger retard, no they're not. an actual hypersonic missile can achieve hypersonic glide at low altitude, making it impossible to intercept. which is why this place surrounded by a few trillion us dollars in anti-air interception systems is a fucking crater.
United States