thousands of Irish people went to America on coffin ships with disease
Potato.
Potato blight.
The English, who had no use for the Irish, spread the potato blight germs around on the potato fields so that they could get rid of as many Irish as possible. It largely worked - millions of Irish either starved to death or immigrated to other nations, like Canada and the USA. (That's why my greatgreatgreatgreatgreat grandfather came to America)
Potato Blight
Yes, Potato blight is endemic in Ireland and Europe, but today a variety of types of potato are grown some of which are blight resistant and we also have chemical sprays that can kill the fungus. The trouble with the blight in the past was that there were no sprays and only one variety of potato was grown and when a blight evolved to attack this variety, it meant that ALL the Irish crop was hit and this lead to famine.
It rots the potato making it unfit for eating.
The potato blight.
The potato famine in Ireland which was caused by the potato blight killed in the region of 2 million people out of a pre-famine population of 9 million, and it started emigration to America, Canada, Australia and other places, displacing another one million during the famine, and many more since.
I think the potato blight first arrived in Cork onboard ships from the US, then spread to the rest of Ireland
The potato blight and the British abandoned Ireland and let everyone to die
During the period from 1845 to 1852, Ireland suffered a famine due to the potato crop getting potato blight which destroyed the crop.
potato blight are potato mold,potato disease,potato mildew and potato murrain.