One reason for the mass migration of many Irish

to North America in the 19th century was

(1) a series of crop failures

(2) enforcement of a military draft

(3) civil war in Ireland

(4) an outbreak of malaria

Verified Answer :

  1. A series of crop failures.

One reason for the mass migration of many Irishto North America in the 19th century was a series of crop failures
This is what sent them to North America in the 19th century.