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1920s; characterized by economic prosperity, jazz music, flappers, and the rise of Hollywood.

Late 19th century to World War I; characterized by peace, economic prosperity, and cultural and technological innovations in Europe.

Late 1940s to 1991; characterized by political and military tension between the Soviet Union and the United States leading to various proxy wars.

14th century to 17th century; characterized by a rebirth in arts, exploration, science, and a gradual decline of feudalism.

Late 20th century to early 21st century; characterized by skepticism, challenges to traditional narratives, and the proliferation of digital technology.

18th century to 19th century; characterized by the transition to new manufacturing processes, urbanization, and technological innovations.

1939 to 1945; characterized by global conflict involving most of the world's nations, mass deaths, and the Holocaust.

Not officially designated; characterized by significant human impact on Earth's geology and ecosystems, including anthropogenic climate change.

Undetermined; will be characterized by events, advances, and challenges that humanity will face.

Around 1,200 BCE to 600 CE; characterized by the widespread use of iron and the emergence of historical states and warfare.

Around 600 BCE to 476 CE; characterized by Greco-Roman civilization, and major philosophical, cultural, and scientific advancements.

5th century to the 15th century; characterized by feudalism, the spread of Christianity, and the Crusades.

15th century to the 17th century; characterized by extensive overseas exploration, and the European colonization of the Americas.

Around 3,300 BCE to 1,200 BCE; characterized by the use of bronze, urban civilization, and writing systems.

1970s to present day; characterized by the shift from traditional industry to an economy based on information technology.

2.6 million years ago to around 10,000 BCE; characterized by the use of simple stone tools and hunting and gathering lifestyle.

1837 to 1901; characterized by the long reign of Queen Victoria, cultural refinement, and advancements in industry and sciences.

10,000 BCE to 4,500 BCE; characterized by the development of agriculture, domestication of animals, and permanent settlements.

17th century to 19th century; characterized by intellectual and philosophical developments that emphasized reason, individualism, and skepticism of traditional authority.