Since 2001 the US has treated the entire world as a war zone. No need for due process, no need to worry about collateral damage. Torture and assassinations are now legal. The ends justify the means. Life is cheap.
Definition of IMPERIALISM
: imperial government, authority, or system
: the policy, practice, or advocacy of extending the power and dominion of a nation especially by direct territorial acquisitions or by gaining indirect control over the political or economic life of other areas; broadly : the extension or imposition of power, authority, or influence <union imperialism>