Why is the separation of government powers a requirement for a society to be free?

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?

The threat of foreign intervention to restore louis xvi to the throne caused the french revolution to ?

What was the role of the samurai in japan before imperialism?