What happend to the population of europe between 1800 and 1900? why ?

Between 1800 and 1900, the population of Europe more than doubled. Instead, populations soared because the death rate fell. Nutrition improved, thanks in part to improved methods of farming, food storage, and distribution. Medical advances and improvements in public sanitation also slowed death rates.

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.