(A) Militarism
(B) Alliances
(C) Imperialism
(D) ** Nationalism
EXPLANATIONS BELOW
Concept note-1: -The nations of Europe competed fiercely for colonies in Africa and Asia. The quest for colonies sometimes pushed European nations to the brink of war. As countries continued to compete for overseas empires, their sense of rivalry and mistrust of one another deepened.
Concept note-2: -The Europe of 1871 was a continent of five great powers divided into two categories. The first grouping were the three most powerful states-Great Britain, Germany, and France. The second grouping were lesser in rank, but remained significant for the period-Austria-Hungary and Russia.
Concept note-3: -These five causes include the four long-term causes (militarism, alliances, imperialism and nationalism) discussed in this reading and one short-term cause (the assassination of Franz Ferdinand).
Concept note-4: -European Expansionism The expansion of European nations as empires (also known as imperialism) can be seen as a key cause of World War I, because as countries like Britain and France expanded their empires, it resulted in increased tensions among European countries.