The population of the colonies that later became the United States increased steadily in the decades prior to , and including, the American revolution. The first decennial census took place in 1790 . Since that time, the natural increase, i.e, the excess of births over deaths, has been a constant contributor to popular growth. The other factor, immigration, has ranged for negligible to large at various points in the nation's history.
After 1830, immigration began to grow again. Although the birth rate showed a decline , the net population growth rate remained high until after the Civil War. In the decade ending 1870, population growth dropped below 30% for the first time in the nation's history. Substantial immigration kept the population rising at 20% or more for each decade until 1920, when the effect of Word War I reduced it to 14.9% .
The attack also destroyed 188 U.S. aircraft and sank or damaged 19 Navy ships. Now, 76 years later, the significance of Pearl Harbor stays with us as Americans remember that this attack launched the United States into World War II. We should also remember this date as a symbol of American grit and resilience.
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<u>The inter- census population growth rate again decreased to 1.35 in 2011. There have been about 60 per cent increase in population from 11.6 million in 1971 to 18.5 million in 1991 and in last one decade it increased by about 27 per cent from 18.5 million in 1991 to 23.2 million in 2001.</u>
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Migration period, also called Dark Ages or Early Middle Ages, the early medieval period of western European history—specifically, the time (476–800 CE) when there was no Roman (or Holy Roman) emperor in the West or, more generally, the period between about 500 and 1000, which was marked by frequent warfare and a virtual disappearance of urban life.
The "Dark Ages" is a historical periodization traditionally referring to the Early Middle Ages or Middle Ages, that asserts that a demographic, cultural, and economic deterioration occurred in Western Europe following the decline of the Roman Empire.The term 'The Dark Ages' refers to the period between the fall of the Roman Empire and the Renaissance: the 5th – 14th centuries. It has been suggested that this period saw little scientific and cultural advancement.
