^ America would no doubt have been a far better place for wildlife, and the American species on the brink would likely not have been so today; Europe OTOH would've been worse off, as all the people who emigrated, made it easier (more opportunities) and less crowded for those who were left.
EzraS wrote:
I've always liked stories about parallel alternate Earths where things are similar but different from our own, due to history unfolding differently there.
I like them too. You might like the series "Sliders".