Meanings of migrating north in English

We were travelling south at the very season when the natives were migrating north.

Ever since the end of Reconstruction, blacks had been migrating north and west, out of the South.

They're migrating north for the summer!

The four-week survey is timed for the peak period for whales migrating north from Antarctic waters to South Pacific breeding grounds.

Every other state and territory except NSW and Victoria has achieved elimination and NSW got very close before Victoria's outbreak saw cases migrating north.

It seemed as if the black man in migrating north left his natural condition behind, and assumed many of the cares of the white man.