The exact date is unknown but between 550 bc and 539 bc.
The enslaved people in Sparta were called Helots.
They were actually the majority of the people in the land dominated by Sparta, according to Herodotus, as many as seven times more than the Spartans.
They worked primarily in agriculture.
The Helots were regularly killed by the Spartans.
Public health
Sanitation standards were created to protect the common good in particular in cities.
During the Second Industrial Revolution, many began moving to the cities. Overcrowding of people and horses created large amounts of waste and very little clean water. Disease ran rampant and sanitation systems were put into place to protect the health of people.
Also known as the Warsaw Pact invasion of <span>Czechoslovakia, it was known as Operation Danube when over an army of 250,000 invaded the country.
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The Army consisted of troops from Poland, Soviet Union, Hungary, East Germany and Bulgaria.
The invasion was conducted to ensure the 'Prague Spring' reforms do not come into effect and that the Community Party in C<span>zechoslovakia, which was friendly to Soviet Union, remained powerful and influential.
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</span><span>However, the invasion was unpopular within the country and a passive-aggressive reaction was seen from the local population. Non-violent acts such as, food, water, and other resources were denied and anti-Warsaw pact graffiti welcomed the soldiers everywhere they went.
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</span><span>There were also negative reactions from around the world and even within the Warsaw pact itself.
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