Iran's World Rank in Population, Per-Capita Income & Life Expectancy (1900 vs. 2006)_

Event_Log

1. ··1917Great Persian Famine and 1918 influenza pandemicCorrelationExpected causation

   Wartime allied grain requisitioning, blockade and disrupted trade routes during World War I trigger severe famine across Iran from 1917, compounded by the 1918-19 influenza pandemic, cholera and typhus under the weakened, occupied Qajar government; mainstream scholarship estimates roughly 2 million excess deaths (Mohammad Gholi Majd has argued for far higher tolls of 8-10 million, a figure not widely accepted among historians), devastating the rural agricultural labor force.

   Why this link: The 1917-19 famine and influenza pandemic killed an estimated ~2 million people, a demographic shock that forms part of the gap between Iran's rough 1900 population baseline and its 2006 level shown in this chart.

   Caveat: This chart shows only two snapshots (1900 and 2006); the famine's specific demographic toll is not visible in the data itself and cannot be isolated from a century of other births, deaths and migration.

   Lag: Immediate mortality shock (1917-19); reflected only in the multi-decade endpoint comparison.Source: Wikipedia — Persian famine of 1917-1919 (cross-checked against Encyclopaedia Iranica's "Influenza" article and academic literature on death-toll estimates)
2. ··19181918-19 influenza pandemic ("Spanish flu")CorrelationExpected causation

   The deadliest pandemic in modern history, first documented among US military personnel at Camp Funston, Kansas on 11 March 1918; over three waves through 1919 it kills an estimated 50 million people worldwide (some estimates run as high as 100 million) and infects roughly a third of the global population, disrupting labor supply, wartime industrial production and global trade simultaneously with the final year of World War I. Iran suffered an acute concurrent toll amid its own 1917-19 famine (see separate IRN entry).

   Why this link: Iran was hit exceptionally hard by the 1918-19 influenza pandemic, with regional mortality estimates among the highest in the world, a shock that depressed Iran's population and life-expectancy standing near the start of the century this chart's 1900 benchmark reflects.

   Caveat: This chart only compares two snapshot years (c.1900 and 2006) and cannot show the pandemic itself; the 1900 figure predates the pandemic, so the link is indirect scene-setting rather than a data point the pandemic directly moved.

   Lag: N/A — chart predates measurable pandemic-year data.Source: US Centers for Disease Control and Prevention (CDC) — "1918 Pandemic (H1N1 virus)"
3. 011956First national census of IranCorrelationExpected causation

   The General Department of Public Statistics conducts Iran's first modern population and housing census (1-16 November 1956) using 27,607 enumerators, recording a population of 18,954,704.

   Why this link: This 1956 count (recording a population of 18,954,704) is the foundational enumeration establishing Iran's modern population data series that this and all subsequent demographic charts build on.

   Caveat: Later WDI population figures are estimates/interpolations, not direct census counts for every year.

   Lag: ImmediateSource: Iran Data Portal (Syracuse University) -- Census