"Migration due to overcrowding" is somewhat misleading, as lack of room has never been a critical issue on a large scale. much more prevalent has been shortages of food or other critical resources, which are the root cause of many migrations, for instance, during the Irish Potato famine which caused many to flee from Ireland to the United States due to the Starvation and ruined economy in Ireland at the time
most went to the United States. Others went to Britian & Canada
As Irish immigration in America was rising due to the potato famine, a thing called nativism was occurring. Nativism was the defense of native-born people(Americans), but hostility to the foreign born(Irish). Nativists were racist and claimed that the Irish were stealing jobs from the native labor force. So, the Native American Party(no affliction with Indians) rose up to challenge this "alien menace." There were also known as the Know-Nothings. They didn't really do much damage and subsided as the Whigs came to power. I believe no laws were passed. All this was happening during Jackson's presidency.
There was a potato famine and thousands of people were starving to death
Most of the immigration was caused by the potato famine, but some were caused when their king had switched to a England church because of his marriage. That caused England to be in control of Ireland which left them weak. Another when the black plague had spread to them from England and the Irish were mad at them cause now, England had made most of their troubles.
The Irish Potato Famine
The Irish immigrated because of the Irish Potato Famine in 1845
The Irish Potato Famine was caused by Phytophthora infestans: fungus-like eukaryotic organisms.
The potato blight caused the famine, the species being Phytophthora infestans.
Assuming you mean America, the 1840s due to the potato famine.
a fungus called phytophthora infestans caused the Irish potato famine.
The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.The potato famine.
The downy mildew caused the Irish Potato Famine during the 1840s.