Is it possible that the USA can make Nuke Cannons? If so, how? Im interested.

you would have to mod it ... is it for a map u made or a pre-made map...

---

If this is not for a map, but for the whole game, see this topic for getting started with modding:
http://www.cnclabs.com/forums/default.aspx?g=posts&t=9305 

You would only need to change CommandSet.ini (search for ChinaWarFactoryCommandSet & move the nuke cannon to the AmericaWarFactoryCommandSet) and factionunit.ini (for generals) or ChinaVehicle.ini (for Zero Hour) where you will need to search for "SCIENCE_NukeLauncher" and remove the three prerequisites, like this:


Would become:


You could also do this, for the same effect:

---

Another question, this time I have problem. --> I am trying to make the US Pathfinder and MissileDefender able to build the Demo Trap from the GLA. I removed all the prerequisites and copied the Commandset, but the button in the game still appears grey. How do i fix it?

Well the Greyed out button could be one of several things. Heres a few things to check and make sure you have set up properly.

Probably not the problem but :

1: Make sure the GLADemoTrap has its prerequisites removed, in this case , it would be the GLA Arms Dealer.

Most likely the problem :

2: The GLADemoTrap is a structure, which is built with the DOZER_CONSTRUCT command. Make sure your unit (infantry ranger or whatever) has DOZER in the KindOf settings, and, make sure to give your infantry the DozerAIUpdate module.

BTW, when assigning the DozerAIUpdate to your infantry, be sure to remove the AIUpdate tag, they seem to clash. I just spent a minute muddling with it and had it up and running in no time. Hope this helps.