Care about where, sorry? No! Only kidding.
I think individual Americans care about all sorts of issues and countries and peoples, of course.
But I think that marharg1956 has made a very reasonable case that the political State in any country makes alliances based on mutual benefit.
That has always been the way of things and is often the way of things even between personal friends, although we feel uncomfortable about admitting it.
Where all the nations go wrong, I think, is in failing to realize that we should all be co-operating with each other for mutual benefit in any case. We really don't need enemies although most Nation States rely on them - and will even start fights in order to have them - in order to maintain internal social cohesion and a sense of a threat from which the people must be protected. There's nothing new in that.
If we could realize that national boundaries are an historically fluid human invention and that in reality we are all utterly dependent on each other, all other life forms and the biosphere for our very survival, we might see 'mutual benefit' as including everyone and everything in global co-operation.
I know these are not common or popular notions in the US but I hope we have freedom of speech left to defend my constitutional right to voice them!