Shenzhen became the first Chinese city to ban eating cats and dogs.
This decision was geared by the COVID-19 pandemic.
Source
The US Air Force accidentally bombed the Swiss city of Schaffhausen.
Great Britain claimed The Straits Settlements as crown colonies: Singapore, Penang, and Malacca.
NASA celebrated April Fool's Day by telling the world that they found water on Mars.
The Netherlands became the first country in the world to allow same-sex marriage.
The Nagorno-Karabakh conflict between Armenia and Azerbaijan began.