In the pilot, Pike shows New York, Washington DC and Paris were destroyed in atomic blasts in World War III. New York and DC make sense. We never saw those cities in the 23rd and 24th centuries. I think it's safe to assume World War III involved America, and major cities on the East Coast were destroyed. The West Coast appears to have been spared, given that San Francisco still exists and nobody in Picard says anything like, "Odd to be in Los Angeles, huh?" (We can also theorize that the reason we've never seen Chinese cities, or many Chinese characters, is that it was the other party in the conflict, leading the "ECON", or Eastern Coalition, Lily refers to in First Contact. Indeed, that's what First Contact co-writer Brannon Braga assumed as well.) But Paris? From what we saw in TNG and Star Trek 6, old Paris was intact with just a few skyscrapers added. Which is plausible. Many of the old buildings in Paris are protected and can't just be torn down. It's also not that hard to imagine the EU, France included, remaining neutral in a China-US war. Was this a mistake? Or an attempt to justify the Shanghai-ed version of Paris Discovery gave us?