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General

Population: Between 190 and 230 million*

• Births: Theocrites (320 BC)
• Exploration: Bytheas of Massilia circumnavigates Britain (325 BC)
  Alexander orders Admiral nearchus to explore Indian Ocean and Persian Gulf (325 BC)
• Mathematics: Zero starts to be used in India (325 BC)
  Euclid publishes "Elements" on geometry (323 BC) - or born this year
• Music: Aristoxenus defines rhythm speech, melody, and movement in music (230 BC)
• Deaths: Alexander the Great (323 BC), Aristotle (322 BC), Demosthenes (322 BC)

Africa

• Egypt: Ptolemy Soter becomes satrap (governor) of Egypt (323 BC)
  Museum and library started (323 BC)
• Libya: Egypt captures Libya under Ptolemy (320 BC)

Americas

• Central America: End of La Venta - center of Olmec culture (325 BC)

Asia

• India: Alexander the Great invades, extends boundaries to Indus River in battle of Hydaspes but soldiers refuse to advance (327-326 BC)
  Start of Mauryan Dynasty this decade to 184 founded by Chandragupta (324-320 BC)

Europe

• Greece: Alexander marries Bactrian princess Roxana (328 BC)
  Earliest papyrus written in Greek that still exists written (325 BC)
  Death of Alexander the Great in Babylon of malaria at age 33 (323 BC)
  End of classical Greece and start of Greece's "Hellenistic Age" (323 BC)
  Demosthenes commits suicide in temple of Poseidon (322 BC)
  End of Athens as separate city-state (322 BC)
  War among Alexander's successors (321 BC)
• Italian States: Renewal of war between Rome and Samnites (327 BC)
  Start of Second Roman-Samite War (321 BC)
  Roman empire expands throughout Italy (320 BC)

Middle East

• General: Alexander conquers Bactria and Sogdiana (329 BC)
• Jordan: Rock-cut tombs made at Petra (320 BC)
• Persia: Start of Atropatene Kingdom to 300s AD (320 BC)
• Syria: Ptolemy Soten of Egypt invades (320 BC)