টেমপ্লেট:Gyaanipedia:OnThisDay/March 20

1602 United Dutch East Indian Company (VOC) forms
1800 Alessandro Volta reports his discovery of the electric battery in a letter to Joseph Banks, president of the Royal Society of London
1815 Napoleon enters Paris after escape from Elba, begins 100-day rule
1900 US Secretary of State John Hay announces that all nations to whom he sent notes calling for an 'open door' policy in China have essentially accepted his stand
1933 Dachau the first Nazi concentration camp, is completed
2016 Barack Obama becomes the first US President to visit Cuba since 1928, arriving for a 3 day tour