Mamata Banerjee is sworn in as the Chief Minister of West Bengal, the first woman to hold this post. Date: May 20, 2011 Read more on Wikipedia → 📅 Other events on May 20 📅 Events on this day in 2011 📅 On This Day (Today)

At least 27 people are killed and 50 others injured when a 6.0-magnitude earthquake strikes northern Italy. Date: May 20, 2012 Read more on Wikipedia → 📅 Other events on May 20 📅 Events on this day in 2012 📅 On This Day (Today)

The government of Singapore authorised the controversial execution of convicted murderer Kho Jabing for the murder of a Chinese construction worker despite the international pleas for clemency, notably from Amnesty International and the United Nations. Date: May 20, 2016 Read more on Wikipedia → 📅 Other events on May 20 📅 Events on this day…

The International System of Units (SI): The base units are redefined, making the international prototype of the kilogram obsolete. Date: May 20, 2019 Read more on Wikipedia → 📅 Other events on May 20 📅 Events on this day in 2019 📅 On This Day (Today)

Russo-Ukrainian war: Russia claims full control of the Ukrainian city of Mariupol after a nearly three-month siege. Date: May 20, 2022 Read more on Wikipedia → 📅 Other events on May 20 📅 Events on this day in 2022 📅 On This Day (Today)

Second Boer War: British troops relieve Mafeking. Date: May 19, 1900 Read more on Wikipedia → 📅 Other events on May 19 📅 Events on this day in 1900 📅 On This Day (Today)

Great Britain annexes Tonga Island. Date: May 19, 1900 Read more on Wikipedia → 📅 Other events on May 19 📅 Events on this day in 1900 📅 On This Day (Today)

Parks Canada, the world's first national park service, is established as the Dominion Parks Branch under the Department of the Interior. Date: May 19, 1911 Read more on Wikipedia → 📅 Other events on May 19 📅 Events on this day in 1911 📅 On This Day (Today)

The Norwegian football club Rosenborg BK is founded. Date: May 19, 1917 Read more on Wikipedia → 📅 Other events on May 19 📅 Events on this day in 1917 📅 On This Day (Today)