the doctrine that maintains that the state should NOT intervene in economics is called laissez-faire. but when the states SHOuLD intervene in the economy, i don't know what its called..sorry!...
If you mean by sending troops into Mexico, no. The United States hasn't intervened militarily in Mexico since the Pershing Punitive Expedition in 1917.
It is the federal governments responsibilty to "provide for the common defense" of the United States as a whole. No state has the authority to declare war on another nation.