he trigger for the migration may be local climate, local availability of food, or the season of the year
the Gold Rush began in northern California.
I'm not sure if this is the right answer, but if you're referring to moving from country to country it is called "Immigration".
The term is migration, more specifically "emigration" from a place and "Immigration" to a place.
migrate!
1. Emigration: Migration from a place (especially migration from your native country in order to settle in another) out-migration. 2. Immigration: Migration into a place (especially migration to a country of which you are not a native in order to settle there) in-migration. One is In the other is Out...
Migration
due to migration there is no particular place.
wildebeest migration
Migration✌
Migration is called migration because it refers to the movement of people or animals from one place to another in order to establish a new residence. The term comes from the Latin word "migrare," meaning "to move from one place to another."
Migration takes place to protect them selves in their enemies and to find foods and sheleter
migration - moving from one place to another (can be national or international)