British Invasion

It seems to happen once each century. In 1775, the Redcoats showed up in Boston. The Beatles made a big splash in the former colonies about two hundred years later, in 1964. And in the sweet-spot between those impactful visits, the house sparrows (Passer domestics) arrived. 

Difficult as it may be to believe, given current controversies and political grandstanding, for a long time America had a very open-door immigration policy that applied to humans and non-humans alike. For example, in the 1850s, when Brooklyn Institute Director Nicholas Pike purchased eight pairs of house sparrows from England, he didn’t need permission from any agency…

Source: British Invasion