A variety of reasons depending on the era and the individual including famine, economic progression, religious freedom and political freedom
They emigrated to the USA
Potato Famine
they immigrated to the US and Canada
From about 1845 to 1852.
Irish immigrants in the USA went to seek work and escape famine in Ireland in the 1800s Ireland its people and politics have never ever colonized another country
The Irish and German people were primarily pushed to immigrate to the US in the mid-1800s due to a combination of factors. The Irish were driven by the devastating potato famine, which caused mass starvation and economic collapse in Ireland. The Germans were motivated by political unrest, economic difficulties, and a desire for greater opportunities in America.
Assuming you mean America, the 1840s due to the potato famine.
the Irish immigrated because of the great potato famine
for freedom and a better life
Ireland
At the time of The Great Famine they immigrated to America and Australia. Nowaday they immigrate to where-ever they want to. There isn't a specific place for them to immigrate to.
The same reason most people immigrate to the US: to have a better life and escape the bad conditions in their homeland.