The event that caused an unstable economy, damaged land in Europe, a government shift in the Soviet Union, and prompted mass immigration in the 1900s is World War I.
World War I (1914-1918) had profound effects on Europe, leading to economic instability in many countries, the destruction of land and infrastructure, significant political changes (including the Russian Revolution in 1917), and considerable population displacement as people moved in search of better opportunities or to escape the aftermath of the war.
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