Sandra Oh's parents move to the US before she's born. She goes into politics.
Here's a potential, made up one: A Chinese family, the Li's move to California in the mid-1800s. They have a son born there, let's call him John, to integrate him more with American culture. He could be a Civil War veteran and go into politics soon after. By the late 1880s-1890s (depending on his birth year) he could be elected to the Presidency, after serving as California Governor. He would be the youngest at the time, (roughly the age that Teddy Roosevelt was) and the first non-white President. A two letter last name, young, and non-white. He could help get some equal rights since he is used to being a minority, though I doubt that the freed slaves would get many rights, probably just more equal rights for Asian immigrants. Hell, he could get a state named after him. Liia.
Sukarno's Parents move the USA, and it has a Mononymous President, and who, therefore, has a last name with 0 letters?
Nah. Immigration officials would force them to adopt a surname, which would likely by Sosrodihardjo (one of his father's names).
But the Romanization at that time would be "Lee", and I believe Hu would be "Hoo" back then.