causes or effects

The many peoples immigrate to a new country more than the past time.
In first reason, the peoples want to get better job opportunity because they consider that they can get a job easily to a new country.
In second reason, the peoples want their children to be educated more superiorly because they feel educational system uncomfortable in a new country.
Finally, the peoples usually want to live in more comfortable and stable place; in climate, in moderate mood, in crime, etc.
Progressing the society, the more peoples might immigrate to a new country according to increasing their demand for life.