International Women's Day (IWD) is a holiday celebrated annually on March 8 as a focal point in the women's rights movement. IWD gives focus to issues such as gender equality, reproductive rights, and violence and abuse against women. Spurred by the universal female suffrage movement, IWD originated from labor movements in North America and Europe during the early 20th century.

The Second International (1889–1916) was an organisation of socialist and labour parties, formed on 14 July 1889 at two simultaneous Paris meetings in which delegations from twenty countries participated. The Second International continued the work of the dissolved First International, though excluding the powerful anarcho-syndicalist movement. While the international had initially declared its opposition to all warfare between European powers, most of the major European parties ultimately chose to support their respective states in World War I. After splitting into pro-Allied, pro-Central Powers, and antimilitarist factions, the international ceased to function. After the war, the remaining factions of the international went on to found the Labour and Socialist International, the International Working Union of Socialist Parties, and the Communist International.