I am still confused why this argument is still valid to anyone...
Not only China has 4 times more population than the US, but they produce all the stuff that the US buys, so if the US had to produce all that stuff on their own they would emit so much more carbon.
Obviously what matters is how much of the world’s products they produce - especially products that require high energy input. I can’t imagine why you think per capita is the appropriate statistic to compare.
This has already been pointed out to you in this discussion, so it seems you are not actually engaging with the information you’re being provided with for some reason.