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Is there any metric to quantify this as a fact or is it just one of these things US people keep telling themself?

In my lifetime I never got the impression that any area was particularly the scientific leader.

How many technological innovations do you remember from the past 20 years and from which areas did they come from?

Surely a few come to mind. Well distributed around the globe, kinda focused around my living area obviously as this is what I hear most.

How do you see that? Do you see an obvious tech leader in all fields somehow?