On September 4, 2011, National Geographics interviews GW Bush about 09-11's impact. He says that he never wanted to be a President of war. But, on 09-11 his progressed Sun was inconjuct natal Eris, symbol of discord (and the start of fights). The attack of foreign terrorists is one of the ways that Eris migt manifests herself in the chart of the leader of the most powerful nation on earth.
There were more transits and progressions, of course . One of those is the aspect that is causing problems for Obama now: transit Neptune inconjunct Progressed Sun. The two joined inconjuctions on 09-11 show the loss of balance and how GWB was being struck by the event. See that post about the charts of the president and his wife on September 11. When I wrote that, I hadn't included Eris, yet. Here is his chart with transits and progressions and... with Eris...
Uranus and Pholus on the Ascendant are reflecting the sudden shocking turning point and his tension. The chart shows only his view and his personal reaction, not a predictable event. Who could have guessed that the USA would be attacked in NY City on September11? Even the fact that the chart of the President has more than 3 difficult aspects within a couple of weeks doesn't mean that it
a) would happen to others than himself
b) would happen in NY
c) would happen on 09-11 (unless the birth time of this AA rated chart would be corrected so that the progressed Ascendant would be exactly square natal Uranus).
You know, when he had problems with his knee in July of 1995, and had to quit jogging, there were heavy transits of Uranus and Pluto and in the progressed chart the Midheaven was conjunct Uranus. It was shortly after a shocking event in American history. On April 19, 1995 (Oklahoma City bombing) with transit Uranus inconjunct the Sun of G.W. Bush and transit Eris opposition Jupiter.