1 Could be the harsh conditions they stayed in .
2 Clovis united all of the Frankish tribes under only one ruler .
3 Victory at Tours ensured the ruling dynasty of Martel’s family, the Carolingians .
4 He founded the Holy Roman Empire.
5 Advance in shipbuilding and navigation.
United State Of American and Canada
Answer:
Immigration is the act of leaving one's countries and moving to another country of which they are not natives, nor citizens, to settle or reside there, especially as permanent residents or naturalized citizens, or to take-up employment as a migrant worker or temporarily as a foreign worker.