The US and Europe are not really great comparisons for a bunch of reasons, but the fundamental one is that Europe has been at Malthusian population limits for a long time, whereas North America has had an essentially unlimited, unpopulated frontier that new people could move to and create lives for themselves.

Thus, the American notion of pulling your self up by your bootstraps was a workable one. Since North America was first colonized by Europeans, Americans have moved west and made a future for themselves and their descendants by using hard work to harvest the bounty of nature. But Europe has been full for thousands of years. You can't just move West, work some land, and raise a family; there are already other people wherever you would want to go.