How many American Cities do you need to destroy before USA economy is completely destroyed and USA downgrated to a 4th world nation after a limited Nuke Attack?

New York
Washington
Seatle
LA

More important American Cities?

New York
Chicago
LA
Dallas
Washington DC
Philadelphia
Detroit

United We Stand.

All or any,because if its hapem all world economy will be destroyed and only not the economy but all kind of world business and life certaly will be very very hard to all.

In all honesty I would argue these interior American cities are more important because they contain the heart of American infrastructure:

-->St-Louis, the former headquarters of McDonnel-Douglas, (bought out by Boeing) and main manufacturing centre of all US military aircraft

-->Houston, the HQ of NASA and US space-based R&D

-->Chicago, 3rd largest US city, HQ of Boeing and huge manufacturing centre

-->San Francisco, heart of US high technology

-->San Diego, heart of US shipbuilding

With the exception of Washington, I think those cities are the most important, even more important than New York or LA!  Why?  Because without manufacturing, the NYSE has nothing important to trade, nor can the decision makers build the tools/weapons necessary to use hard power.  And who cares about LA, did Hollywood ever win on the real battlefield?

Ok,but you cant forgot the US Navy force and Air Force bases around the world and with a very strong nuke power for give the answer to who send the nukes or try to send,because the attack can be finesh before get the target with the nuke defense sistem.

Of course MAD assures that this would never happen. Anyone who would carry out a nuclear attack on the US would be hit even worse in return.

The American Marine Division has the highest combat effectiveness in the American armed forces. It seems not enough for our four divisions to surround and annihilate its two regiments.

---Mao Tse Sung to General Song, prior to Chosin Reservoir