Wikipedia:Selected anniversaries/May 10
May 10: Mother's Day in various countries, Constitution Day in the Federated States of Micronesia.
- 1503 - Christopher Columbus and his crew became the first Europeans to visit the Cayman Islands.
- 1857 - The Sepoy Rebellion broke out in colonial India, threatening the rule of the British East India Company.
- 1869 - The First Transcontinental Railroad of North America was completed with a golden spike ceremony.
- 1924 - J. Edgar Hoover (pictured) became director of the U.S. Bureau of Investigation.
- 1940 - Prime Minister Neville Chamberlain of the United Kingdom resigned and formally recommended Winston Churchill as his successor.