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May 1 in history: Great Britain issues first adhesive postage stamp and more

1840
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1840

Great Britain issues world's first adhesive postage stamp 'Penny Black'

1889
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1889

International Socialist Congress observes first May Day

1961
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1961

Fidel Castro declares Cuba a socialist nation and abolishes elections

1972
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1972

Nationalization of coal mines in India

2009
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2009

Sweden legalises same-sex marriage