The death of archduke Francis Ferdinand of Hungary was the initial cause of ww1. However there was a build up to ww1. Countries had new powerful weapons and wanted to capitalise on this. The navy’s of many countries were being expanded. Political disagreements between countries led to increased tensions.
The most significant contributing factor to the Steel Strike of 1919 in the US was the end of World War I, which left many of those workers who had unionized in federal unions with less opportunities for work then prior and during the war.
