Wikislippy:Selected anniversaries/April 4

From Wikislippy

• April 4:
• 1850 - Los Angeles, California is incorporated as a city.
• 1949 - Twelve nations sign the North Atlantic Treaty.
• 1964 - The Beatles occupy the top five positions on the Billboard Hot 100 pop chart.
• 1975 - Microsoft is founded as a partnership between Bill Gates and Paul Allen.