Contemporary: 1900 to Present

Period 6: Accelerating Global Change and Realignments (1900 to the Present)
Key Concept 6.1 — Rapid advance in science and technology altered the understanding of the universe and the natural world and led to advance in communication, transportation, industry, agriculture, and medicine.
Key Concept 6.2 — Peoples and states around the world challenged the existing policial 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.