About 30-40 million depending on which part of the 19th century.
Australia's population increased in the 19th century because of the discovery of gold.
why did Britain want to send criminals to faraway places in the 19th century
I believe that it was about 10% of the white population of the 19th century South that were slaveholders?
Britain did.
japan
Great Britain
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.
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In the 19th century, about 80% of people in Britain lived and worked in the countryside. This figure began to decline with industrialization and the growth of urban centers. By the early 20th century, the majority of the population had shifted to urban areas.
It was rather long
the slave trade
In the 19th century? To rule the world. Which it very nearly did.