I'm afraid your claim about me being mistaken is mistaken. Given your words below, it's clear I am subject to your apparenty moving of goal posts. [The specific talk was about accepting immigration, not about giving citizenship, as you go through below. ]

I'll play along with the game, despite the moving of goal-posts.

I know naturalized French citizens who did not speak French at the time of acquiring French citizenship. They are neither rich nor famous. If you want to move the goal posts again from "given the history of European countries" to the more recent present, this discussion won't be that.

The UK, France, Belgium, Sweden, Norway, Denmark, Finland, Spain, Portugal, and Italy all have citizens who were immigrants that acquired citizenship of those countries when they didn't speak the official languages at time of filing for and getting citizenship.

And the so-called history of European countries being stricter regarding immigration is questionable. For one, many take in a high proportion of refugees than most countries on the planet, including us; for two, there was immigration within and to European states even before there was immigration to the US.

Many European countries have a higher proportion of immigrants from a non-bordering area than most countries outside of the Americas.

Also, the US gives more people headaches to enter than European countries. Look at the number of people who need a visa in advance vs. who don't to visit in different places. For just one example, take a look at the ease with which Brazilians can go to certain countries yet not go to the US.

Are you now asking about citizenship or immigration? It's hard to answer questions when dealing with goal-post moving.