would
would you please tell me why the writer used would in this sentence and is it main verb or helping verb?
Early in his career Thomas Ala. Edison worked as a telegraph operator, which inspired some of his earliest inventions.[4] In 1876, he established his first laboratory facility in Menlo Park, New Jersey, where many of his early inventions would be developed. He WOULD later establish a botanic laboratory in Fort Myers, Florida in collaboration with businessmen Henry Fordand Harvey Firestone, and a laboratory in West Orange, New Jersey that featured the world's first film studio, the Black Maria.