"Make America Great Again." That was the slogan of Donald Trump's insurgent campaign to take the US presidency. It resonated with many Americans. They felt that the US had been subject to serial humiliations in its international dealings, and that Mr Trump's more robust and confrontational leadership would help to reverse it.
But politics is full of paradox. To exercise power is to diminish it. Power accumulates to those who understand restraint. In Britain English and Welsh voters took to heart the slogan of "Take Back Control" and voted for Brexit. The country is now basking in the thrill of exercising direct power in its relations with its fellow European neighbours. And yet the result will be a medium-sized power adrift in a friendless world, seeking to trade freely when everybody else is becoming more protectionist It will be more rather than less subject to the whims of foreign powers. Britons may prefer it that way, but they will come to understand that the keys to "taking back control" actually lie in Westminster and their local council chambers, rather than in Brussels.
So it is in America. Mr Trump's supporters will revel in the assertion their country's direct power. And yet he will exercise this assertiveness in order to carry out a retreat. The result can only be diminishment, relegating the US to the middle part of a medium-sized continent.
Let's look at some specifics. Consider the Trans Pacific Partnership (TPP): the multinational trade deal put together by President Obama. This was a central element of his Asian diplomatic strategy, designed to collect a number of Asian countries into America's orbit in trading terms, conspicuously excluding China. Mr Trump (along with many Democrats) denounces this as a bad deal and will scrap it. That leaves a vacuum into which China is ready to pounce. It plans its own version of a free trade area, involving most of the same countries. Mr Trump has also questioned the value of America's military alliances in the region. The clear message to countries there is that they must acquiesce with China's increasingly imperial ambitions. The Philippines' President Duterte looks a little less eccentric in his pivot to China. The USA is suddenly a much less important country.
Mr Trump's promised assertiveness in trade relations with China makes little sense either. It comes at an important moment in the evolution of China as a nation. It has built its economy on international integration, especially with the US, and developed a large trade surplus in the process. But there is nothing particularly beneficial in a trade surplus - it implies that a country's citizens are consuming less than they could - an act of self-denial. A trade surplus has political advantages - it makes you less beholden to foreign creditors - but China is already powerful enough for this not to matter much. So it is in the process of carrying out an economic pivot to develop its consumer economy, and away from integration with developed economies - though the scope for integration with less developed economies remains. An economic model where it exports less to America and integrates more with other Asian countries, and even African ones, suits it just fine strategically. Mr Trump means to hurry it along, but it will disrupt the US economy more than the Chinese one.
In Europe the issue is not so much trade. The proposed trade deal between the US and the European Union, TTIP, looks dead in the water without any help from Mr Trump. The main issue for Europeans is military and diplomatic support for the European countries against Russia in particular. Mr Trump has said that the current balance involves America in a disproportionate level of commitment. He has a point. If America steps back from its military commitments, and caves in to pressure from Vladimir Putin to create and extend a Russian sphere of influence, then it will put European countries in a very tough position. It is not very clear where this will lead - but one thing is very clear: America will be less important to Europe. This is not necessarily a bad thing for Europe, but it will be very uncomfortable.
And then there is economics. We are still guessing what will emerge from Mr Trump's presidency - but there could well be a short-term lift for America. Some form of fiscal stimulus is in the offing. Mr Trump and his advisers hope to lure in US corporate profits that are stacked offshore for tax reasons, and to use the proceeds to fund infrastructure investment. Unlike many of his Republican colleagues, Mr Trump will be reluctant to cut state handouts, like pensions or healthcare - though health insurance is under threat. This could give a short term lift to the US economy . And, as this week's Economist points out, much of this gain will be at the cost of other world economies.
That should please Mr Trump's supporters. But the problems will start quickly. The stimulus is badly timed. In many aspects the US economy is running at close to potential output. All the stimulus might do is suck in imports and push up prices. But there may well be a lot of hidden potential in the US economy - more workers could be drawn into the workforce, and other workers could be made to work more productively. But if Mr Trump is serious about rolling back free trade and driving out foreign workers, then he will cut the capacity of the US economy when it needs to be increased. A financial crisis is in the offing.
The truth about the American economy is that, far from being taken for a ride and funding lavish lifestyles of foreigners, American consumption is being supported from abroad. This is what a trade deficit means. A transition to a more self-sufficient economy, as wished for by Mr Trump's supporters, will entail economic shrinkage. Americans may rail at the loss of jobs in many industries, but they exchanged these for cheaper products, made abroad or with automated technologies, or both. Reversing that means reducing living standards.
Except that most Americans could still end up better off. If the country can share out income more evenly, with lower profits and higher wages, and more of those wages paid to middle and lower level employees and less to the top layer, then this shrinkage need not be painful to the majority. But what chance is there of a Republican administration, run by senior businessmen, achieving that? To Mr Trump exploitation is simply good business practice, and profits are reward for enterprise. There is no sign of a mindset that wants a different distribution of the fruits of economic success.
America and the world is in for a rough ride. But strategically it has been clear for a long time that American power, relative to the rest of the world, is in decline. That is not such a bad thing - it results from a fairer distribution of the world's wealth. After the diminishment of Europe, it is now America's turn. Mr Trump's victory marks a big step along that journey. But it should surprise no follower of politics that he is claiming to do the opposite.