Note: this is written following my post of the "Presidential Strategy" a few minutes ago
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You will never notice a significant difficulty if you never place your civilization in a position of weakness.
A strong, powerful civ will force peace whether the rest of the world wants it or not. However, the UN is an excellent way to follow the Harry Truman/Neville Chamberlain methods of appeasement if you refuse to equip your armies properly and defend your cities from evil aggressors. With the UN, you can proclaim you "have peace in our time", but it will not last.
Do not tolerate aggressive neighbors. If necessary, nuke them and make them sue for peace... or just wipe them off the map and rebuild/run your new territory the right way. The AI understands nukes, even without the UN. In the end, the UN only prolongs the inevitable final struggle for the forces of good to overcome the forces of darkness in the rest of the world. As the world knows, the UN will not force the enemy to uphold his end of the bargain!
With a powerful democracy, you will find it is normally not necessary to launch any nukes at any time, though it is good to have one or two for negotiations. Powerful air forces and ground units can defeat any incursions or sneak attacks, like happened in the one-two sneak attacks of the evil North Koreans and evil Red Chinese in the Korean War.
Learn from Truman's examples of military betrayal and inept leadership... keep modern, powerful forces at any border, ready to spring into action. Do not hamper, stymie, and cripple your military. When the forces of evil attack, do not hesitate to push them back beyond their original point of attack. Do not yield ground paid for with the blood of your military.
If other nations sneak attack, don't expel yellow fluid on yourself and sue for peace like Truman did...
attack and defeat the enemy, even if you have to sacrifice some economy in the short run. Take the war to the enemy... root him out... and if peace comes, remain strong and ready to repel the inevitable sneak attacks of the future. Do not allow the enemy to enslave entire cities for decades. Do not allow a long-term cease fire.
There is no substitute for victory.
[This message has been edited by starlifter (edited June 30, 2001).]