Hypothetical question: What will happen to USA's nukes & their ability to launch them , if..?

nuclear warheads can be delivered as:

1. bombs (obviously you don't need satellites for this)

2. cruise missiles (Wikipedia: "The lowest cost system in wide use uses a radar altimeter, barometric altimeter and clock to navigate a digital strip map. Some systems may now use satellite navigation or inertial guidance, but these are substantially more expensive...")

I think ballistic missiles need GPS but I'm not sure. either way we have plenty of nukes that don't need satellites, enough to destroy the world once over, I'm sure.

Obviously you really have not thought this through. Do you honestly think that we don't have a back up system just in case our satellites were taken out? Satellites face a barrage of meteors all the time, and even if we lost them we would still be able to launch. You don't always need a rocket to deliver a nuke, thats why we have fighters, bombers, and battleships that are nuclear weapons capable. All these delivery systems can be based on old fashioned tactics. We even have rockets we can control with a joystick, so no matter what happens we will still have an option to strike back with.

ICBM targeting is pre-programmed. They could be guided more precisely with satellites, but when you're talking 50+ megatons, precision is not very essential.

B52s could drop enough bombs to carpet bomb the planet.