A general response would be M.A.I.N. (Militarism, Alliances, Imperialism, and Nationalism). As each major European power had practice such ideas and ultimately lead them to into battle with each other.
However to put (M.A.I.N) in context, upon the assassination of Archduke <em>Archduke Franz Ferdinand</em> by Serbian separatist, which ultimately lead to the Austria-Hungarian Empire declaring war against Serbia. However, Serbia had an alliance with Britain, France, and Russia (Allies). Whilst, Austria-Hungary had alliances with the Ottoman Empire & Germany (Central Powers). Which subsequently enacted every major European power to declare war on the basis of their alliance's agreement.
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
The Emancipation Proclamation changed the meaning and purpose of the Civil War. The war was no longer just about preserving the Union - it was also about freeing the slaves
many people wanted further political reform. Chartism was a working class movement, which emerged in 1836 and was most active between 1838 and 1848. The aim of the Chartists was to gain political rights and influence for the working classes.
