Why is it important within democracy that power are separated ,checked, and balanced

It's is important because, the separation of powers is enshrined into the Constitution because it's an essential element of the Rule of Law. Checks and balances make sure that the three powers interact in an equitably balanced way, which is important to a democracy.

Explanation:

they remained in rural areas and worked at jobs such as lumbering or farming.

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.