Maine became the 23rd state to join the United States of America.
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Explorer Christopher Columbus wrote a letter about his travels to the New World.
Robert Foster made a world record for holding his breath underwater.
Dr. Bernard Fantus and his team opened the very first 'blood bank' in Cook County Hospital, Chicago, US.
1.4 million students across 125 nations participated in the School Strike for Climate.
Mikhail Gorbachev was elected as the Soviet Union's first President.
