Actually from what I read the US is looking and developing a couple of projects, including manned mars landing and manned asteroid landing and some very interesting projects. Moon to them is done.
The US isn't as done as people make it out to be, they are just in the middle of some incredible projects. Keep in mind, compare to NASA, China and India is like not spending at all.
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zootinali
The ISS has a life span, it's nearing it's end again, the US could try to keep it going, but as I said previously they are looking at other more advanced projects. The Europeans are also launching one so maybe their plan is continue their work on the European one while working on other projects.
The Chinese one is not as big and it's functions will be most likely more limited.
This is why I hate the US for not allowing us to work with them, we are reinventing the wheel. A lot of men power wasted on projects that's been done. One day when we do catch them, China would have lost valuable time that could have been used to further space exploration instead of just matching the current milestones.