but I'd argue some like the Koreans, Vietnamese and Latinos that trace it back to at least 70 years ago being in the US and have made a contribution to the country can claim to be American.

There’s always space for exceptions, every single empire/ world power had exceptions on who they let live there. The problem is when you let people keep the identity of their former nation here, that will always breed conflict. The reason Europeans were able to assimilate is because they ditched the language and loyalty to the countries they came from. They took English Christianized names and were made “like” or assimilated, 1/3 of European immigrants WENT BACK TO EUROPE because they couldn’t assimilate, this was how it worked for thousands of years, and was utterly destroyed by shitlibs and neocons who demand that we fold to foreigners. It was a quiet invasion planned methodically.