Key Concept 6.1 — Rapid advances in science and technology altered the understanding of the universe and the natural world and led to advances in communication, transportation, industry, agriculture, and medicine.
Key Concept 6.2 — Peoples and states around the world challenged the existing political and social order in varying ways, leading to unprecedented worldwide conflicts.
Key Concept 6.3 — The role of the state in the domestic economy varied, and new institutions of global association emerged and continued to develop throughout the century.
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- Assassination of Trotsky | History.com article about assassination