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Black Plague started by rats from China and killed about 1/3 of Europe's population at the time.
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Major increase in technology that caused people to move to the cities so they could work in factories. This caused child labor and increased alcaoholism in men because women and children worked for a lower price than men.
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A huge outbreak of disease that killed around 400,000 Europeans.
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Steam Engine revolutionized the world at the time and was used for powering different machines in factories.
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A mass starvation in Ireland that reduced their population by 20-25% at the time.
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Huge disease that killed 3-5% of the world's population.