wtf, why are you happy about this? both collapsing under a failing economy and you are cheering up over their failures?
This is really sad, but should not come as a surprise.
Politicians - too often taking the short term view - call the shots on multi-B$$ projects like this. And if the (US) politicos think there is more to gain by going it alone ... what do you expect?
Then too, there likely are US space secrets of military value that would be revealed in a joint program.
And further - from military AND economic viewpoints, the long term view suggests whoever gets there first, wins .... and wins a great deal. Consider the lack of European cooperation in the post Christopher Columbus era.
What will it take to get past this kind of thinking? Will we ever come together as one? Carl Sagan suggested that solid evidence of extraterrestrial intelligence would pull humanity together as one. And quite interestingly, Sagan also thought that evidence (unlikely) of humans being completely alone in the universe would do the same thing.