World War I (1914-1918), a very significant global military conflict, is generally attributed by historians to a combination of significant long-term and immediate causal factors, most significantly including:
- **A)** World War I's own significant causes having no meaningful, describable relationship to significant nationalist competition, alliance systems, or the broader significant tensions already discussed in an earlier unit's coverage of New Imperialism
- **B)** A single, isolated cause with no meaningful contribution from any other significant factor of any kind, a characterization that significantly oversimplifies the genuinely complex, multi-causal origins of World War I already discussed at multiple points throughout this unit
- **C)** Significant nationalist competition and colonial rivalry (already discussed in an earlier unit's coverage of New Imperialism), a complex system of European military alliances, considerable militarization, and the immediate precipitating assassination of Archduke Franz Ferdinand of Austria-Hungary in 1914 - this combination of long-term and immediate factors illustrates a further significant example of the genuinely complex, multi-causal origins of significant global conflict already discussed at multiple points throughout this unit
- **D)** A complete absence of any significant international tension of any kind prior to 1914, a characterization that directly contradicts the very significant, well-documented international tensions already discussed at multiple points throughout this unit and an earlier unit's coverage of New Imperialism
World War I is generally attributed by historians to a combination of significant long-term and immediate causal factors, most significantly including significant nationalist competition and colonial rivalry, a complex system of European military alliances, considerable militarization, and the immediate precipitating assassination of Archduke Franz Ferdinand of Austria-Hungary in 1914.