Yours really is another ironic comment.
The British at least tried to stop it by making it illegal to take the machines out of the country
The Americans sent the machines to China themselves to save a few bucks on labor.
Modern export restrictions are akin to making it illegal to take machines out of a country.
Even if it was somehow exactly the same thing happening, saying "you did this 200 years ago so I'm going to do the same thing now" isn't any kind of acceptable reasoning. Mauritania can't say that they are cool to have slaves because America had slaves 170 years ago. Or rather, they can say that, it just isn't very convincing.
It's just history repeating itself, delude yourself however you want that Amrrica holds some moral high ground by holding life improving knowledge to ransom.
I'm no China fan, but Inthis defending America is pathetic.