From about 1845 to 1852.
They immigrated to British North America because they felt like it
The famine in Ireland had started, so many people left the country. Some went to America.
Ireland had a massive famine between 1845 and 1852, even though 4000 ships filled with food grown in Ireland were exported to cities in England. British landlords in Ireland wanted to be able to make profit at the expense of starving Irish people. Those that left Ireland in "coffin" ships traveled to Canada, the United States, and even Australia.
They travelled by ship.
The Famine - when Irelands potato crop failed on a national scale millions of people emigrated to escape, irreversibly changing the population now its only 4.5m or so whereas before the famine it was around 15m!!!
Assuming you mean America, the 1840s due to the potato famine.
Potato Famine
They immigrated to British North America because they felt like it
there was a potato famine that lasted several years killing millions
Because they were falsely led to believe that American is the most free country in the world.
A famine in Ireland caused many to immigrate to the US in the mid 1800s. The Irish economy became too reliant of the potato crop which was the livelihood of about one third of the people at that time. A potato disease that had spread through Europe wasn't as serious a catastrophe until it came to Ireland, where much of the economy depended on the potato.
The famine in Ireland had started, so many people left the country. Some went to America.
Because they can.
Ireland had a massive famine between 1845 and 1852, even though 4000 ships filled with food grown in Ireland were exported to cities in England. British landlords in Ireland wanted to be able to make profit at the expense of starving Irish people. Those that left Ireland in "coffin" ships traveled to Canada, the United States, and even Australia.
They travelled by ship.
they emigrated to America
Some people came because they were hoping for jobs and more income than the country they came from.