One legal theory behind patents is that they were a tool to incentivize immigration. It benefited the United States even before it was the United States, as people was encouraging to stay in the country during the duration of exclusivity, and gave the country a working model of the invention so people could learn. Before patents, many invention was treated as city or state secret.
I can recommend a very interesting talk by Professor Eben Moglen, who teach law history and actually read discussions that happened between the people who wrote and worked with the first implementation of the US patent law (https://www.youtube.com/watch?v=LPzpBn-XGxw).
I can recommend a very interesting talk by Professor Eben Moglen, who teach law history and actually read discussions that happened between the people who wrote and worked with the first implementation of the US patent law (https://www.youtube.com/watch?v=LPzpBn-XGxw).