Study changes in the Allied forces, including consequences of the Bolshevik Revolution and Russia's withdrawal for German strategy and the reasons for and impact of USA entry.

Evidence focus: Part three: Ending the war in BA Conflict and tension: the First World War, 1894-1918 (Paper 1 Section B: Wider world depth studies) provides the direct anchor for this learning objective. Students focus on Study changes in the Allied forces, including consequences of the Bolshevik Revolution and Russia's withdrawal for German strategy and the reasons for and impact of USA entry. The explanation should use the subtopic wording, the relevant period, named events or individuals where appropriate, and precise historical evidence. It should then separate cause from consequence, change from continuity, and significance from importance while keeping sources, interpretations, evidence and opinion distinct.