Military "dominance" cannot be measured by money spent. Keep in mind the Americans pay $500 for potty seats, $8,000 for Allen wrenches, and an average of $7,500 per DAY, per person, to keep troops abroad. The U.S. military has a tremendous capacity to generate violence. But that is mostly of the thermonuclear variety. The U.S. Army, and Marine Corps can only field about 60% of the ground combat troops they had in South Vietnam, at the height of the Vietnam War. They are ridiculously expensive in upkeep, and small in the number of ground combat troops they can actually field. That would put them at a serious disadvantage in a real-war scenario with China, or the Russian Federation.