What is the reason for the great migration of peoples?

The main reason for the resettlement of masses of people was the search for better conditions for life. People tried to find comfortable lands. This is due to the fact that there was a general cold snap and the peoples moved to the West, where milder climatic conditions prevailed. Frequent crop failures and diseases also contributed to the resettlement. The Huns lost in China and went west, which also led to resettlement. Of course, the decline of the Roman Empire was the key reason for the migration of peoples from the periphery.