Because of wars, food shortage such as the Great Potatoe Famine in Ireland, and goverment as well as certain laws.
1815-1840
some
Migration rose during the Great Depression.
Born to Explore - 2011 Canada The Great Polar Bear Migration 1-17 was released on: USA: 18 February 2012
Great!
the great migration
great migration; cities in the North
20,000
Midwest
The Irish were a prominent group (caused by the potato famine,) but people came from all over Europe. There were far-fewer immigrants from South America, Asia and Africa as the immigration authorities heavily favored Europeans.
Push: impacted canada by having more farms Pull: Get more money
"great" is an adjective, and "migration" is a noun.