The US government’s foreign policy is often described as ‘imperial’ & so its inevitable difficulties are generally considered to be those of an imperial power. There is, however, a fundamental & crucial distinction between this short-term 21st (& 20th)century policy & the ‘permanent’ empires of the 18th & 19th centuries. A permanent empire meant career administrators, who spent an entire working life in a particular region. They were around to bear the long-term consequences of policies. Hence their outlook was that of any permanent civil servant; & imperial policy was formulated for the long-term - permanent - administration of these territories. This attitude influenced even the most senior appointees who were in a region for a short period. Thus, on one occasion, Lord Curzon (then Viceroy of India), wrote to a British official criticising any attempt to shape Indian tax policy for British electoral purposes. Curzon then referred to ‘our cotton manufacture’ - by which he meant the Indian - as against the British - textile industry.
American foreign policy in the 21st century stands at the opposite extreme: it manifests the shortest of short-term outlooks. This is inevitable, since it has to fit in, largely, with the US electoral timetable. This also means much - if not most - ‘foreign’ policy is directed very much for *domestic* effect. Thus the problems it meets are those that accompany & follow, a succession of short-term military (& other) interventions abroad. These expeditions may involve helping to topple one set of rulers & replacing them with another, but the operation is short-term, looking (almost entirely) to the immediate impact at home.
The slogans that are offered to justify military interventions -‘nation-building’, ‘establishing democracy’, etc. - clearly are intended for electoral consumption & for the gullible or ignorant. Short-term military adventurers, no matter how powerful, *can* intervene only in *continuing* historical contexts: even the greatest superpower on earth is incapable of recreating a history. The only questions are, what does this intervention add to the political mix? How do the other factions also contending for political power change their strategies? Who is strengthened? Weakened? Thus an additional strand is woven into the political fabric flowing from the loom.