"the American copyright statutes did not allow for copyright protection of foreign works for fully one century. As a result, American publishers and producers freely pirated foreign literature, art, and drama....It was not until 1891 that the Chace Act granted copyright protection to selected foreign residents."

https://eh.net/encyclopedia/an-economic-history-of-copyright...

They started allowing non-citizens to get U.S. patents earlier:

"Americans could not obtain patents for imported discoveries, but the earliest statutes of 1793, 1800 and 1832, restricted patent property to citizens or to residents who declared that they intended to become citizens. As such, while an American could not appropriate patent rights to a foreign invention, he could freely use the idea without any need to bear licensing or similar costs that would otherwise have been due if the inventor had been able to obtain a patent in this country. In 1836, the stipulations on citizenship or residency were removed, but were replaced with discriminatory patent fees: foreigners could obtain a patent in the U.S. for a fee of three hundred dollars, or five hundred if they were British. After 1861 patent rights (with the exception of caveats) were available to all applicants on the same basis without regard to nationality."

https://eh.net/encyclopedia/an-economic-history-of-patent-in...

It was tech related to water powered cotton mills. In those times England had outlawed the exportation or manufacturing machinery as well as the emigration of persons with industry knowledge.

Sam Slater moved to the US in 1789 and partnered with a textile manufacturer to recreate the technology from memory. (Amusingly what he did may not have even been a violation of IP law by today's standards)

https://www.ipwatchdog.com/2017/07/05/americas-industrial-re...

Samuel Slater apprenticed at a British cloth factory and memorized the design. Then he emigrated to the US and set up shop. Although, I think it might be more correct to say that the US allowed him to steal IP, rather than the country stealing it.

https://en.wikipedia.org/wiki/Samuel_Slater

I think that US publishers, especially sheet music publishers, would copy British music and and publish it in the US, since I don't think that the US honored British copyright (at least some subset of it), but I can't think of good search terms to find any sources.

Well I don't know about IP but the Colonies were a haven for pirates, privateers, mercenaries and smugglers.