Citroën sold cars in the US till around 1975, when the US introduced regulations that essentially prohibited the hydropneumatic suspension. Citroën even had US spec versions of the DS and the SM for the US market.

I am not sure whether the 2CV was ever sold in the USA, but it has definitely been imported. I think in the US, the limit is 25 years before you can import a foreign car. I've encountered plenty of 2CVs and Méharis in North America.