Irish potato famine
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The Price Revolution
Germany invaded Poland
It led to independence for many countries.
The Holocaust.
The First Crusade
The event that led to the constitutional convention, was the articles of confederation
The major revolutions across Europe in the 1840s led to a massive increase in immigration to the US. Large waves of Germans, Irish, Swedes, French, Italians, etc. all made their way to the country.
Both were attacked, leaving devastation and destruction, which led to the USA going to war.
The assassination of Archduke Ferdinand was a major event that led to WW1
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George Washington led the battle