Those who came as refugees from Europe have sometimes lost their families, through death or migration to other parts of the world.

That translates to over 70,000 new people a year, mostly through migration.

Contact with industrialized nations brought Muslim populations to new areas through economic migration.

The county's population reached 100 persons in 1869, entirely through migration and settlement.

Such changes could result in the gravest effects of climate change through sudden human migration.

There has been a net annual loss of population through migration in recent years.

In the same period, the city had a net gain through international migration of 460,000 people, or more than 6 percent of the city's population.

In 1988 more than 500,000 people left Tokyo, which experienced a net loss through migration of nearly 73,000 for the year.

From there, they slowly spread to northern Africa, mainly through migration and trade.

It now occurs in other parts of the world through migration.