Dylan, keep your country in secured mode. Secured mode is a good thing.. It ensures that no one will wipe you off the map and gives you one country that you can keep all your cash and good assets in without worrying about someone overrunning you and taking all of it.
You can still attack computer controlled countries while in secured mode, and if you eventually want to wage war with another player you can build up a war slave funded by your secured main country.
Trust me, 2 trillion will not buy you enough nuclear power to ward off any blood thirsty warmonger. Secured mode is a free guarantee that you won't be overrun, so focus on building your econ so you can afford to nuke everyone on Kebir Blue later ;)