I dont think the military bases is good inforrmation. I dont think thats gonna happen. At least not under this government.
I find good to establish relationships with other than traditional powers. I like the US being challanged by other power, I like Argentina having now the Russia card to play, as well as the China card.
Its a world changing, the US no longer controls this area of the world as they did. This was an historic area of influence for the US, their "back yard", they controlled governments for decades, they put dictatorships, killed thousands along the continent.
I celebrate this change. Of course we have to be careful with these new powers. But I rather a multipolar world than one empire everywwhere.