The Potata Famine took place from 1845 to 1852, resulting in huge numbers of people dying or emigrating.
The famine, which was caused by potato reducing Ireland's population by millions through death from starvation and emigration.
Australia's population increased in the 19th century because of the discovery of gold.
I believe that it was about 10% of the white population of the 19th century South that were slaveholders?
About 30-40 million depending on which part of the 19th century.
Northern Ireland only came into existence in the 20th century, so you could say the answer is the 20th century. However there is historical reasons for the conflict that can be traced back over many centuries, to the 19th, 17th and earlier, as far as the 12th century.
Industry and trade grew rapidly, in the northwest, during the 19th century, due to the large population of immigrants. The convenient trade routes to Europe also contributed.
(Apex) Millions of people fleeing Ireland for the Americas.
During the 19th century japan expanded into Korea and China
Ireland.
At the beginning of the 19th century, the Russian Empire extended from the Arctic. Like all empires, it included a large disparity in terms of economics, ethnicity, and religion.
Home Rule in Ireland was the demand to cancel the Act Of Union of 1800 and confer a degree of Independence on Ireland.
Immigration from Europe and East Asia spurred the growth of population in the US in the 19th century. Also, in the antebellum days, the slave population also increased.