I mean, it's a penny on 1,000, or probably a lot less than that, frankly. So I can not only not imagine a person whose decision to write would be governed by such a thing, I cannot imagine a European who would come to America to copyright his work for such a reason.
American copyright protections are not available to non-US citizens
The authors statement implies that Europeans can come to America for copyright, therefore it must be available to them
( z1 available :polarity - :ARG1 ( z2 citizen :mod ( z3 country :polarity - :name ( z4 name :op "United" :op "States" ) ) ) :ARG2 ( z5 protect :ARG1 ( z6 copyright ) :mod z3 ) )