Some hints for possible update?
Do not allow settelers to be built. *severly lowers the difficulty*
Conquest only - you stated that America was at war with France and Japan and yes, I did start my first turn by declaring war againt both countries but after 10 or 20 turns, we were back at peace, I was rebuilding my country and I eventually won the space race.
Resources, all countries can maintain peace for as long as they with and still build up a fairly large army. Try cutting back or have each side had the resource the other two need. That way, trade agreements or war are the only ways to build up a force.
Positive stuff, thank god for no X axis wrapping, I feared that from the begining.
Overall Grade - 7.5/10