The American state can end capitalism to a Marxists satisfaction

 The US state can give the workers everything they want there.

https://www.marxists.org/archive/marx/works/1872/09/08.htm

You know that the institutions, mores, and traditions of various countries must be taken into consideration, and we do not deny that there are countries -- such as America, England, and if I were more familiar with your institutions, I would perhaps also add Holland -- where the workers can attain their goal by peaceful means.

Karl Marx