World War II would not have gone on forever. It would have ended very soon if we had attacked the mainland. Truman was a freaking idiot who couldn't even keep his figures of casualties the same number. Sometimes its 200,000, then its 500,000 and then its 350,000 and then its over a Million!
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Anyways, regarding nukes. When I am facing an enemy which is equal, I will not start researching nukes unless he does. And then ofcourse I will not launch a nuke unless someone else does.
I think the Modern age nuke is way too weak. I mean yesterday I had a opponent nuke my army and I still had a lot of infantry survive after being hit at ground zero.
As for where to launch it. Its usually in Modern Age that I get nuked, so I use the nuke I have ready to bomb the military buildings he has closest to my border. Then when I get a chance to get another nuke, I will launch it at one of his cities. Sometimes the capital, sometimes a city which looks to be making even more resource gathering for the opponet, and sometimes the city cloest to my army to go in and take it.
And I just have to say, Space Program is the greatest wonder EVAR! But I really think it should be a technology you can research. Because its not something one nation has. America has it, Russia has it, Britain has it, China has it, India has it, etc...