2015 European migrant crisis

The 2015 European migrant crisis was a period of significantly increased movement of refugees and migrants into Europe, mostly from the Middle East. An estimated 1.3 million people came to the continent to request asylum, the most in a single year since World War II. They were mostly Syrians, but also included a significant number of people from Afghanistan, Pakistan, Iraq, Nigeria, Eritrea, and the Balkans.

Source: Wikipedia — 2015 European migrant crisis (CC BY-SA 4.0)