Two things to consider. In the book of Daniel it talks about the political system in the time of the end as made up of clay and iron. Symbolising that although they would cohabit together, they really wouldn’t mix. Parts of this world power would be strong and at the same time weak. As the poster above put it as “ lf is that of a people obsessed and scared of ghosts, unable to converse without resorting to threats or always having to bang his fist on the table.”
The 2nd point is that although they don’t like each other they are forced to climb into bed with each other. In order to keep a state of equilibrium. If it come down to China taking on America and it allies. I think America would show its steel like qualities. But for now they are joined together at the foot of the image of Daniels prophecy.