Per capita is rather pointless when talking about climate change, but yes, it doesn't absolve responsibility.

You'll note that's not what I said, just that the US is doing well at reducing CO2 emissions. The population has grown 17%, but emissions have reduced 18%. That's a good job.

US manufacturing has not decreased either, it has just not increased while offshoring elsewhere. So for the most part that decrease in CO2 is not simply moving the problem elsewhere.