Ecological migration refers to migration for the purpose of protecting the special ecology of a certain area or restoring the ecology of a certain area. It also refers to the immigrants who move out the local people as a whole because of the harsh natural environment and lack of the conditions for local poverty alleviation.
According to the above definition, which of the following is ecological migration?
Hundreds of years ago, the residents of the Central Plains moved to the south as a whole to escape the war and became Hakkas