In reply to Anna, post 1457. I am Australian, a Federation, where the States manage internal matters, and the Fed manages external matter, as nereo pointed out for the US in post 1473. In Australia, this arrangement broke down early this year, during our disastrous wildfires, where the Fed took a long time to mobilise the Australian Army to help fight bushfires, because bushfires are a state responsibility, even though bushfires do not respect state boundaries.
Throughout history, government officials have had to deal with erratic monarchs. I cite the example of Edward 8th of England, a narcissistic, irresponsible and incompetent king, reminds me of someone, whose reign mercifully lasted a little under a year. I have been impressed with the way world leaders have worked around Trump, recognising that Trump is hos own mouthpiece, not influenced by the US State Dept.
In Nov this year, I urge all right thinking Americans to GET OUT AND VOTE against Trump.