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  2. 1940 United States census - Wikipedia

    en.wikipedia.org/wiki/1940_United_States_census

    A number of new questions were asked including where people were five years before, highest educational grade achieved, and information about wages. This census introduced sampling techniques; one in 20 people were asked additional questions on the census form. Other innovations included a field test of the census in 1939.

  3. World War II casualties - Wikipedia

    en.wikipedia.org/wiki/World_War_II_casualties

    World War II deaths by country World War II deaths by theater. World War II was the deadliest military conflict in history.An estimated total of 70–85 million deaths were caused by the conflict, representing about 3% of the estimated global population of 2.3 billion in 1940. [1]

  4. List of timelines of World War II - Wikipedia

    en.wikipedia.org/wiki/List_of_timelines_of_World...

    Timeline of the United Kingdom home front during World War II (1939–1945) Timeline of the Molotov–Ribbentrop Pact (1918–1941) Timeline of Sweden during World War II (1939–1945) Timeline of the Netherlands during World War II (1939–1945) Chronology of the liberation of Dutch cities and towns during World War II

  5. World War II - Wikipedia

    en.wikipedia.org/wiki/World_War_II

    World War II [b] or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all the world's countries participated, with many investing all available civilian resources in pursuit of total war .

  6. Estimates of historical world population - Wikipedia

    en.wikipedia.org/wiki/Estimates_of_historical...

    In many early attempts, such as in Ancient Egypt and the Persian Empire, the focus was on counting merely a subset of the population for purposes of taxation or military service. [2] Published estimates for the 1st century (" AD 1 ") suggest uncertainty of the order of 50% (estimates range between 150 and 330 million).

  7. Timeline of World War II (1945–1991) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_World_War_II...

    This is a timeline of the events that stretched over the period of late World War II, its conclusion, legal aftermath, with the inclusion of the Cold War, from January 1945 to December 1991. January 1945

  8. United States census - Wikipedia

    en.wikipedia.org/wiki/United_States_census

    The United States census (plural censuses or census) is a census that is legally mandated by the Constitution of the United States. It takes place every ten years. The first census after the American Revolution was taken in 1790 under Secretary of State Thomas Jefferson. There have been 23 federal censuses since that time. [1]

  9. List of wars by death toll - Wikipedia

    en.wikipedia.org/wiki/List_of_wars_by_death_toll

    Bubble chart of wars with over 1.5 million deaths. [222] Combatant deaths in conventional wars, 1800-2011. [223] Seven deadliest wars after 1900. The length of each spiral segment is proportional to the war's duration and its area size to its death toll.