The purpose of federalism is for the development of state ,to achieve the balanced between states & to utilize the resources for fulfilling needs of peoples
A. Violent attacks form the Eastern tribes even led to the downfall of Rome, as soon as the mongols got to Rome they had no challenge in defeating such a weak nation in it's decline.
People such as John Locke, (who the colonists looked up into his writing), believed that people were born with natural rights, such as life, liberty, and property. The colonists in America believed similar, and got inspiration from what John Locke wrote in a book.
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Christiaan huygens he is the one who invented the clock