Josh Marshall of Talking Points Memo looks at the big picture: 

It’s interesting to step back sometimes and consider … our times. Today we have our ongoing battle over democracy and authoritarianism in the U.S. The UK is in its latest stage of its ongoing national self-immolation. Italy has just elected its first far-right government since Benito Mussolini’s rise to power in the early 1920s. Russia, which has made itself into the international clarion of rightist nationalism, is stumbling through a succession of largely self-inflicted catastrophes in its war of choice in Ukraine.

Let’s go back to the Arab Spring. The Arab Spring unsettles or topples governments across the Arab Middle East. But it triggers long-running civil wars in Syria and Libya. The first especially, but also the second, are the main drivers of the European Union migrant crisis of 2015, in which some 1.3 million refugees/migrants requested asylum in the EU, the most in any single year since World War II. Given the closeness of the vote and the great focus on the migrant crisis in 2015 and 2016, it’s very hard to imagine the UK leaves the European Union without this chain of events … beginning in December 2010.

Less obvious is that you can make a looser but I think still fairly persuasive argument that these events play a key role in the rise of [MAGA-ism] in the United States….The rise of [MAGA-ism] is part of a long progression within the United States. [However, their leader’s] particular platform — to the extent you can call it that — focused on “the wall” and immigrants from Mexico and Central America….

But there’s a somewhat different commonality I am focusing on.

The [reactionary] right is, paradoxically, highly internationalized if not internationalist. There’s a deep confluence and sharing of ideas, imagery and programs between the U.S. and Europe. The narratives of “our out of control migration” and white Christian cultures under threat was a common, interwoven and reinforcing pattern on both sides of the Atlantic….

These are of course only the barest thumbnail outlines of recent history and its relationship to the present…. Why this interests me is that migration flows and their intensity are going to increase over time. The most basic reason is climate. Our potential climate futures range from really bad to truly catastrophic. But anywhere on that spectrum you have lots of people trying to move from places that are less habitable than they used to be or are in the throes of political and economic instability for those same reasons. Telecommunications and transport technology greatly accelerate that process.

A century ago a poor peasant in India or Ecuador may have known in a general way that there were vastly richer societies in Europe and North America. But they couldn’t really know the details and it was close to impossible to get there anyway. Today, almost everyone in the world can see through electronic media how people live in Europe, North America, and other parts of the affluent world and — though it’s hard and often dangerous — it is possible to get there.

What we can draw from this is that the accelerating patterns of global migration which are so central to the politics of the last decade and have helped reshape politics in Europe and North America will almost certainly continue to intensify.