Wikipedia:Selected anniversaries/May 4
May 4: Remembrance of the Dead in the Netherlands, Greenery Day in Japan.
- 1471 - Wars of the Roses: Yorkist Edward IV defeated a Lancastrian army in the Battle of Tewkesbury.
- 1855 - William Walker and a group of mercenaries sailed from San Francisco to conquer Nicaragua.
- 1919 - The May Fourth Movement began in China with large-scale student demonstrations in Tiananmen Square, Peking against the Paris Peace Conference and Japan's Twenty-One Demands.
- 1970 - The Ohio National Guard shot at students in Kent State University protesting the United States invasion of Cambodia.
- 1979 - Margaret Thatcher (pictured) became the first female Prime Minister of the United Kingdom.