Ask HN: Readings on migration and xenophobia?

The rise of xenophobia as a retreat from decades of migration liberal policies in the West -- Brexit, the U.S. Border Wall "situation", rejection of the UN migration pact -- seems to have become a persistent crisis. Are there any narratives or compelling books that you've read in 2018 that give a thoughtful analysis of how we got here? Who are the innovative thinkers and doers here?