May 31

Saturday 31, 1997:

Canada's Confederation Bridge opens, linking Prince Edward Island with mainland New Brunswick.

Friday 31, 1985:

The US-Canadian Outbreak: Forty-one tornadoes hit Ohio, Pennsylvania, New York, and Ontario, leaving 76 dead.

Saturday 31, 1924:

The Soviet Union signs an agreement with the Peking government, referring to Outer Mongolia as an "integral part of the Republic of China", whose "sovereignty" therein the Soviet Union promises to respect

Monday 31, 1790:

Alferez Manuel Quimper explores the Strait of Juan de Fuca.

Wednesday 31, 1578:

Martin Frobisher sails from Harwich, England to Frobisher Bay, Canada, eventually to mine fool's gold, used to pave streets in London.