Roughly 20 million people who were born in a country now a part of the European Union have moved from their birth country and now live in another EU nation.
About half of those who applied for asylum in Europe during the refugee surge of 2015 and 2016 were still waiting to learn their fate as of the end of last year.
Millions of people around the world have migrated to the U.S. and other countries in recent years – some voluntarily, others to flee political turmoil, persecution or war.