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 Offa's Dyke - between English and Welsh
  - brief account
 O for the Wings of a Dove
 Ogaden - and Ethiopia
  - brought within Ethiopia
  - warfare in 1977
 Ogedai - successor to Genghis Khan
 Ogham (alphabet)
 Oghul Khaimish - widow of Güÿuk Khan
 O God, our help in ages past
 Ogoni - and Ken Saro-Wiwa
 Ogooué river - and Brazza
 O'Higgins, Bernardo
 O'Higgins, Kevin - and the Free State
  - assassinated in 1927
 Ohio - statehood in 1803
  - and the National Road
 Ohio river - explored by La Salle
 Ohio valley - Adena and Hopewell culture
  - claimed by French in 1749
  - in the French and Indian War
 Oh What a Lovely War (musical)
 oil - in Venezuela
 Oil Crisis (1973-4)
 oil paints - contrast with tempera
 Oil Rivers - name for the Niger delta
 Oise - crossed by Germans in 1940
 Ojeda, Alonso de - and Venezuela
 Ojukwu, Odumegwu - and Biafra
 Okello, Tito - in exile with Obote
  - and Obote's return to power
 Okinawa - battle in 1945
 Oklahoma - and the run
  - and statehood in 1907
 Oklahoma City - origin as tented town
 O-Kuni - and kabuki
 Olaf - king in southern Sweden
 Olaf I - king of Norway
 Olaf II - king of Norway
 Olaf IV - and the Scandinavian kingdoms
 Old Bailey
 Old Believers - and Russian Orthodoxy
 Oldcastle, John - Lollards
 Old Codgers
 Old Comers - or Pilgrim Fathers
 Old Contemptibles
 Old Czechs - political party
 Oldenburg - annexed by France in 1810
 Old English - or Anglo-Saxon
  - and Beowulf
 Old English - in Ireland
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