America declared indepdence in 1776 and they used the Greek model as a template to build a free society.
Roman?
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The American ideal spread to Europe and other places. But it evolved slowly, from abolishing slavery in 1863, to giving women the right to vote, to civil rights movement to immigration reform where everyone from around the world can come instead of just Europeans.
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Abolishing of slavery was spearheaded by the British...political participation by women was well established in communist states prior to the US, Americans had to fight very hard to overcome their racial divide, and so on...there was no doubt a lot of influence Western states had amongst each other, however I don't think it was a one-way outflow from America....