Pressure your government to demand "we won't spy on your citizens" pledges from each of their allies. If the US declines, ask how it can seriously call itself an ally.
I think people in the US don't understand effectively how afraid US allies are about criticising it. No one ever wants to stick it's head above the parapet and risk damaging relations - even when the US does bad stuff like torture in Gitmo. Especially if your from a small country. Even a big country like Germany is more afraid about damaging relations than standing up for the rights of its own citizens.
True, but the constitution does make deliberate distinction between 'people' rights and 'citizen' rights. Due process is among those that affect more than just citizens.
Today I noticed my French insurance contract for my company explicitly forbid me from storing data in the US. It's certainly not related to privacy, but I'm happy they push that way.