Answer:
The tactic used by unions where workers refuse to work until their demands are met is called a strike.
Explanation:
A large union might call a strike in order to leverage better working conditions for union members, like a teachers' strike or air traffic controllers' strike. Organizations might also call a general strike when many union and nonunion people might decide to forego work and other activities in support of a change or to protest an issue. One of the largest historical examples in the United States is the Pullman Strike, which took place in 1894. From May to July of that year some 250,000-factory workers walked off the job at the Pullman Palace Car Company in Chicago to protest long workdays and reduced wages. The American Railway Union joined forces with the strikers and refused to work on or run any trains that were transporting Pullman products.
The alliance system played an important role by leading to World War I, as countries that were in alliances with other countries were obligated to support their allies when war was declared.
In World War I, two major alliances faced each other. On the one hand, the Triple Alliance formed by the Central Powers: the German Empire and Austria-Hungary. Italy, which had been a member of the Triple Alliance together with Germany and Austria-Hungary, did not join the Central Powers, as Austria, against the agreed terms, was the aggressor nation that unleashed the conflict. On the other side was the Triple Entente, formed by the United Kingdom, France and the Russian Empire. Both alliances underwent changes and there were several nations that ended up entering the ranks of one or another side as the war progressed: Italy, the Empire of Japan and the United States joined the Triple Entente, while the Ottoman Empire and the Kingdom of Bulgaria joined the Central Powers.
