To be fair he wrote his stuff a long time before all out war became redundant. Now it is small proxy wars, as in Syria. Trump is talking himself into dumping his allies by praising his opponent. Could be a clever move if his opponents ( Russia etc. ) fall for it. The worry is he may not be clever enough to swing it. The US is just about out of funds which doesn't help. He and the US is probably better off building things like a high speed rail line from East to West. Providing water to draught areas etc.
Wars are prohibitally expensive
Wars are prohibitally expensive