Wikipedia:Selected anniversaries/April 30
On April 30:
- 313 - Roman emperor Licinius unifies the entire eastern empire under his rule.
- 1803 - Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million more than doubling the size of the young nation overnight.
- 1975 - North Vietnamese troops took Saigon, ending the Vietnam War.
- 1992 - CERN announces that World Wide Web will be free to anyone, with no fees due