Re: Goodbye Washington DC
The effect of such an attack would depend on the style of game I would be looking to set up for the players. Overall any of the game worlds would be pretty dark given the event which happens. Here are a couple of ideas.
Dark Champions with standard point heros. Kick the world into the gutter. Washington is toast, and the US takes out the Axis of Evil. Iran, North Korea, and Syria become atomic wastelands. The fallout from DC, while small, still causes a massive panic and virually everyone from southern Connecticut to mid Virginia flees. Economic and social chaos ensues, the US pulls its troops home and effectivly shuts the door to the world. Supers are really the main force holding the country together, with a high body count.
If you want less of an effect on the world situation add in force field tech. In a world of supers there is also a super tech. It only stands to reason goverments would aquire and use such tech to protect its most important assests. So damage could be less then it appears at first. Supers ( a la the Ray in Kingdom come) with energy absorption powers could clean up the worst of the blast leaving the death toll and disruption to daily life far less than expected. A different version of the Patriot Act would pass taking into account a world of supers. A draft for supers only would most likely play well with the public. There would be notable exceptions who refuse, while others would sign on before the bill passes. And herein lies the first problem for the heros, sign up or not.
Heros could be rogue and wanted by the goverment. But, they still defend America in their own way. Or they sign on and are assigned to either the military or a new branch of Homeland Secruity.(Use a modified version of Primus.)
Overall what happens to the world, the US, and other counties depends on the route you as a GM choose to take with the world. Set the tone, then make the world events fit the tone.