What is the period of humanitarian flooding?

Humanitarian flood period, also known as European refugee crisis, refers to a series of humanitarian crises caused by the influx of refugees and immigrants into Europe from 20 15 to 20 16. The trigger of this crisis is the Syrian civil war, which caused millions of people to flee their homes, many of whom were displaced and sought safety and shelter. In addition, refugees and immigrants from Afghanistan, Iraq, Libya and other countries have also joined this trend of flocking to Europe. This refugee crisis has put pressure on many European countries, and refugees and immigrants have suffered on the way, which has also triggered a series of political and social disputes. During this period, the EU and governments of various countries have taken a series of measures, including strengthening border control, implementing refugee quota system, and strengthening assistance to refugee camps, in an effort to cope with this crisis.