The Joseon prince went to America and didn’t return is a Manga/Manhwa/Manhua in english language, Adventure series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Due to a sudden natural disaster, Park Byung-jun, a Korean-American lobbyist, finds himself reincarnated as Yi Kang, the second son of Emperor Gojong of the Korean Empire, at the moment of his death. Armed with his knowledge of the original history, he crosses over to the United States and begins his own new business to amass wealth!