Migrants, mostly Venezuelans, walk across the Darien Gap from Colombia into Panama.

Around the world, far-right populist parties continue to stoke the popular backlash against global migration, driving some centrist governments to adopt a tougher line on immigration. But with short-term strategies dominating the debate, many of the persistent drivers of migration go unaddressed, even as efforts to craft a global consensus on migration are hobbled by demands for quick solutions.