Assuming you mean the USA, best way to solve that is for the data to never cross into US controlled facilities or equipment at all. Using apps made in Californ

Assuming you mean the USA, best way to solve that is for the data to never cross into US controlled facilities or equipment at all. Using apps made in California on operating systems also made in California to send messages to servers controlled from California and then trusting that the encryption works the way they say it works makes much less sense than just sending messages through EU carriers. Consider, the Signal threat model assumes that you can't trust telcos. That's usually based on the assumption that you're some ordinary grassroots citizen who might be spied on by the government. But the EU Commission is the government. It seems a bit odd for them to implicitly assert the national European telecoms companies are untrustworthy.