I am sure JK Rowling would still make a lot of money from American if the US had not signed a copyright reciprocity treaty with UK in the late 19th century.

I imagine that Rowling would sell her manuscript to US publishers in an auction house before putting her work on sale globally.

Who knows? She probably make a few million dollars on the low side and much more if the US publishers are real crazy about it.

Heck, this lead to a premises of my next novel(for the moment, I am writing a novel on a bunch of subversive robots). An American publisher/pirate decides to get into the mechanical computer business. He purchased an invention from a mother of an inventor and proceed to violate the inventor's patent by selling it to the average UK consumer, and then the world, ushering in the computer revolution.