The world in the 420s BCE

Wars and battles 11

• Battle of Amphipolis · battle · 422 BCE
• Battle of Delium · battle · 424 BCE
• Battle of Sphacteria · battle · 425 BCE
• Battle of Naupactus · battle · 429 BCE
• Battle of Pylos · battle · 425 BCE
• Battle of Olpae · battle · 426 BCE
• Battle of Spartolos · battle · 429 BCE
• Battle of Tanagra · battle · 426 BCE

and 3 more in the atlas.

Unrest and atrocity 1

• Mytilenean revolt · unrest · 428 – 427 BCE

Treaties 1

• Peace of Nicias · treaty · 421 BCE

Wars and battles 1

• Archidamian War · war · 431 – 421 BCE

Unrest and atrocity 1

• Mytilenean revolt · unrest · 428 – 427 BCE

Famine and plague 1

• Plague of Athens · plague · 430 – 426 BCE

Born 2

• Plato · philosopher · 429 – 349 BCE
• Artaxerxes III · ruler · 425 – 338 BCE

Died 5

• Herodotus · writer · 484 – 425 BCE
• Pericles · statesperson · 495 – 429 BCE
• Anaxagoras · astronomer · 500 – 428 BCE
• Protagoras · philosopher · 490 – 420 BCE
• Zeno of Elea · mathematician · 490 – 425 BCE

Europe15 states

• Ancient Greece · 1201 BCE – 600 CE
• Ancient Rome · 753 BCE – 476 CE · Hostus Lucretius Tricipitinus, Roman consul since 429 BCE
• Roman Republic · 509 – 27 BCE · Hostus Lucretius Tricipitinus, Roman consul since 429 BCE
• Macedonia · 808 – 167 BCE
• Etruscan civilization · 750 – 265 BCE
• Scythians · 700 – 201 BCE
• Colchis · 1701 – 164 BCE
• Scythia · 800 – 400 BCE

and 7 more; every state of Europe.

Middle East and North Africa23 states

• Ancient Egypt · 4001 – 30 BCE
• Babylon · 1894 BCE – 1 CE
• Troy · 3000 BCE – 500 CE
• Achaemenid Empire · 550 – 330 BCE
• Phoenicia · 2500 – 64 BCE
• Persian Empire · 550 BCE – 1979 CE
• Kingdom of Kush · 2180 BCE – 350 CE
• Ancient Carthage · 814 – 146 BCE · Hannibal Mago, monarch of Carthage since 440 BCE

and 15 more; every state of Middle East and North Africa.

South Asia17 states

• Magadha · 1201 – 345 BCE · Nagadasaka, king since 437 BCE
• Gandhara · 751 BCE – 535 CE
• Mahajanapadas · 600 – 345 BCE
• Panchala · 901 – 401 BCE
• Avanti · 701 – 301 BCE
• Vajjika League · 701 – 401 BCE
• Malla · 601 – 301 BCE
• Surasena · 701 – 301 BCE

and 9 more; every state of South Asia.

East and Southeast Asia21 states

• Zhou dynasty · 1101 – 256 BCE · King Kao of Zhou, Chinese king since 440 BCE
• Warring States period · 476 – 221 BCE · King Kao of Zhou, Chinese king since 440 BCE
• Old Chosŏn · 2333 – 108 BCE
• Chu (state) · 722 – 223 BCE
• Qin · 905 – 221 BCE
• Yan (state) · 750 – 223 BCE
• Qi (state) · 1045 – 221 BCE
• Lu · 1101 – 249 BCE

and 13 more; every state of East and Southeast Asia.

Americas and Oceania3 states

• Maya civilization · 2001 BCE – 1521 CE
• Olmecs · 650 – 351 BCE
• Zapotec civilization · 6701 BCE – 1201 CE

Location unknown8 states

• Argead dynasty · 700 – 309 BCE
• Chedi kingdom · 601 – 301 BCE
• Qedarites · 801 – 201 BCE
• Dao · 1001 – 222 BCE
• Kingdom of Rajarata · 601 BCE – 1300 CE
• Eastern Zhou (state) · 770 – 249 BCE
• Xǔ · 1064 – 375 BCE
• Ruo · 1046 – 256 BCE