Labor Day the Knights of Labor, which organized the first parade in New York City. In 1887, Oregon was the first state of the United States to make it an official public holiday. By the time it became an official federal holiday in 1894, thirty states in the United States officially celebrated Labor Day. Canada's Labour Day is also celebrated on the first Monday of September. More than 80 countries celebrate International Workers' Day on May 1 – the ancient European holiday of May Day. (May Day was chosen by the Second Internationale of socialist and communist parties to commemorate the Haymarket
Mines on the first day of the Somme Mines on the first day of the Somme The 19 mines on the first day of the Somme comprised a series of underground explosive charges, secretly planted by British tunnelling units beneath the German front lines on the Western Front during the First World War, ready to be detonated in the morning of Saturday 1 July 1916, the first day of the Battle of the Somme (1 July – 18 November 1916). The joint explosion of these mines ranks among the largest artificial non-nuclear explosions. The tunnelling companies of the Royal Engineers were to make two major contributions to the