June 1887

Wednesday 08:

Herman Hollerith receives a patent for his punch card calculator.

Saturday 18:

The Reinsurance Treaty is closed between Germany and Russia

Tuesday 21:

Queen Victoria's golden jubilee.

Thursday 23:

The Rocky Mountains Park Act becomes law in Canada, creating that nation's first national park, Banff National Park. http://www.pc.gc.ca/apps/cseh-twih/archives2_E.asp?id=25

Tuesday 28:

Minot, North Dakota incorporated as a city.