Looks like they better invade Australia, they have more minerals than USA 
There are about 185 nations in the world from Afghanistan to Zimbabwe, but the world's ores and other minerals are not spread evenly among them.
A few years ago a think-tank studied the global distribution of 15 metals with important uses. It found that:
Just 16 nations hold 87 percent of the world's reserves based on value;
Just 5 hold almost 60 percent;
And that the United States was third among the five.
The Soviet Union was first, holding all 15. But that union has been dissolved. The resources were divided among new states of untested stability and uncertain experience with free markets. Second was Australia, a continent, with 13.
The United States has 12 of the 15 metals.
http://www.nma.org/newsroom/speeches_pop/112801.html