Era milestone year places a health achievement in the year it actually happened. Wikipedia notes that "the World Health Organization certified the global eradication of the disease in 1980," a single year that closed a campaign fought for decades. Browsing by year sets a milestone in the wider timeline of health history.
Facts
Comparison
Era of EmergenceSourced to the subject's own account Era (Milestone Year)
Sources
1. Wikipedia: Sanitation
WikipediaSanitation, History section, ancient RomeQuote, Sanitation, History section, ancient Rome
The first sewers of ancient Rome were built between 800 and 735 BCE.
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