Great Migration
The large wave of people who moved from Britain and Ireland to British North America between about 1815 and 1850.
emigrant
A person who leaves their country to live elsewhere. (They are an immigrant when they arrive.)
quarantine
Keeping sick or possibly sick people apart so a disease does not spread.
cholera
A dangerous disease spread by dirty water. It struck the colonies in 1832.
typhus
A disease spread by lice in crowded, dirty conditions. It killed many Irish migrants in 1847.
canal
A human-made waterway, often with locks, built for boats.
lock
A chamber with gates in a canal that raises or lowers boats from one water level to another.