What is a good example historical comparison

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Canada and the United States are both countries
President Lincoln's Presidential Administration
Slaves fought in both the American Revolution and Civil War

A good example historical comparison could be the similarities and differences between the French Revolution and the Russian Revolution. Both revolutions were the result of widespread discontent with the ruling monarchy and social inequality, but the outcomes and ideologies that emerged from each revolution were vastly different. The French Revolution led to the rise of Napoleon and the establishment of a republic, while the Russian Revolution resulted in the establishment of the Soviet Union and the spread of communist ideology.