Probably around the same amount of IP that US citizens stole from the UK in the 19th century. We stole loads of inventions during the Industrial Revolution.

Does it surprise you to find out that a lot of old money families in the US made their money smuggling opium and other similarly unethical things? We are a nation of crooks and thieves and always have been.

I ask anyone reading this comment to please study history more frequently, it will help you understand the world better.