the American Revolutionary War (1775–1783),
the French Revolution (1789–1799),
the Haitian Revolution (1791–1804),
the Spanish American wars of independence (1808–1826),
the European Revolutions of 1848
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The first was the great bubonic plague which happened in 1665. This was the last great epidemic of the plague which swept through London and killed over 100 000 people which was more than 20% of the population of the time. It also swept through many parts of Southern England and killed even more if we count those victims too.
The second was the Great Fire of London which happened less than a year later in 1966. The fire was so huge that it burned down the homes of approximately 70 000 people, which is important because the whole population of the city was 80 000. Over 13 000 houses were burned to the ground as well as almost a 100 churches.
Siberia is known to be one of the coldest places on the planet, but exactly how cold and snowy it gets each year has big ramifications elsewhere on the globe.
In North America, a more snow-covered Russia means that colder air will have an easier time harvesting in Siberia and departing for our continent's heartland. Early in the calendar year, the air coming from Siberia can be cold enough to bring snow to even more southern reaches of the United States if the pattern sets up correctly.
What era are you talking of? If so, then was it Beringia? Could you please specify?