system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what would happen if the U.S attacked Iran?
gpt
The muslim world would become more galvanized against the west, oil prices would rise because the persian gulf would be a war zone making transport of oil from that region more expensive, a lot of warmongers and business men would get richer, a lot of soldiers would die, several orders of magnitude more civilians would die, the U.S. economy would fall further into debt and recession, non nuclear countries would redouble their efforts to become nuclear as that has been the only proven deterrent to american aggression, china would further strengthen its position as the dominant world force as america declines, leaving everyone to wonder if russia and china would ever go to war or unite under a quasi communist/socialist association. 

The ironic thing is that unlike its government, the people of Iran are fairly modern and open minded.  So destabilizing the Iranian government could in the longterm speed up democratic reforms in the region as Iran has sway in several other countries, such as syria.  But if that was the real goal, then the U.S. should invade Saudi Arabia instead, but that won't happen because they sell oil to the U.S. at prices we can live with. They keep us happy enough to overlook the oppressive theocratic saudi despotism.