The migration began in the 1970s and is still continuing the growth.

Beginning with the third phase, migration began to take on a more economic character.

Beginning in 1899 a small migration of Japanese began that continued until the 1970s.

The first frost came and the migration began in earnest.

The great migration from the world's slums is only just beginning.

Of course, no one is sure when the migration began.

The great black migration from the South had only begun.

Large-scale migrations for the new world only began in the 1880s.

It is believed that this migration began around 6,000 years ago.

It is believed that the migration in and out of India began around 6,000 years ago.