Causes and effects of 20th-century wars

The question asks about the specific pre-1914 assumption that was proven wrong by WWI and WWII. This is not a question about technology or alliances in isolation, but about the optimistic view held by economists and commentators before 1914.

Before 1914, a strand of European and American thought held that industrialization and economic interdependence — the deep trade and financial links between great powers — had made prolonged, large-scale war too costly to be rational. This view predicted wars would not happen because they were economically irrational.

WWI broke out in 1914 despite the deep trade and financial links between the belligerents, directly disproving this optimism. WWII reinforced the lesson. The historical record showed war remained a tool of state policy regardless of economic integration.

The correct answer is that industrialization and economic interdependence would make large-scale war too costly to pursue — this precisely captures the pre-1914 optimism that the 20th century's wars refuted.

The question targets a specific pre-1914 intellectual assumption, not the general causes or outcomes of WWI. You are looking for a belief people held before 1914 that turned out to be wrong.

This option misrepresents the pre-1914 assumption. Some thinkers argued technology made war more destructive, but the syllabus specifically identifies the optimism as resting on economic interdependence, not on the idea that armies would disappear.

This was not a widely held pre-1914 optimistic assumption about the decline of war; it describes a shift in the form of conflict rather than the belief that major interstate war would fade. It does not match the specific claim tested here.

This option describes the logic of deterrence, which is a separate concept. The pre-1914 optimism tested here was rooted in economic logic — that trade links made war unprofitable — not in alliance deterrence theory.

Only 'Industrialization and economic interdependence would make large-scale war between great powers too costly to pursue' matches the specific pre-1914 assumption documented in the historical record and disproved by WWI and WWII.

The question refers to a documented reversal in the ratio of combatant to civilian deaths across the 20th century. This is a key quantitative shift used to illustrate the changing nature of warfare.

In the early 20th century, warfare was still conceptually a contest between uniformed armies. By the 1990s, more civilians than combatants were being killed in wars. This shift resulted from total war doctrine, strategic bombing, nuclear weapons development, and the rise of guerrilla and civil wars in which fighters are embedded among civilian populations.

Multiple mechanisms drove this reversal: total war treated civilian infrastructure as a legitimate military target; air power allowed destruction of cities far from front lines; guerrilla warfare blurred the distinction between fighters and non-fighters. Each progressive shift moved violence closer to civilian populations.

The correct answer is that civilian deaths came to outnumber combatant deaths in wars by the end of the century — this matches the documented historical pattern precisely.

The question asks for the accurate description of the 20th-century shift in who bore the human cost of war. You are looking for a statement that is historically documented and analytically precise.

Improved medicine is a real historical development, but it does not describe the overall pattern of the century. The key shift was not that fewer soldiers died but that more civilians died relative to combatants — these are different claims.

This is factually incorrect. Interstate wars did not disappear, and soldiers continued to die in large numbers throughout the century. The shift was in the ratio of civilian to combatant deaths, not the disappearance of combatant deaths altogether.

This is the opposite of what occurred. Despite the development of international humanitarian law, civilian casualties increased as a share of total war deaths during the century. The historical record contradicts this option directly.

The only accurate statement is that civilian deaths came to outnumber combatant deaths in wars by the end of the century, reflecting the cumulative effects of total war, air power, and guerrilla conflict across the 20th century.