Conflict Conflict Combatant 1 Combatant 2 Result Liberian–Grebo War (1875–1876)
Liberia Supported by:
United States
Grebo people Victory World War I (1914–1918) Allied Powers France Britain Russia (1914–17) Japan Italy (1915–18) United States (1917–18) Serbia Montenegro Belgium Romania (1916–18) Portugal (1916–18) Brazil (1917–18) Hejaz (1916–18) China (1917–18) Greece (1917–18) Siam (1917–18) Liberia (1917–18)
Central Powers German Empire Austria-Hungary Ottoman Empire Bulgaria (1915–18) Victory World War II (1939–45) Allied Powers Soviet Union (from June 1941) United States (from December 1941) United Kingdom China France (1939–40, 1944–45 ) In exile for part of the war Poland Norway Netherlands Belgium Free France (1940–44) Luxembourg Greece Czechoslovakia Other important belligerents
Canada India Australia New Zealand South Africa Yugoslavia Liberia Ethiopia Brazil Mexico Colombia Cuba Philippines Mongolia Co-belligerents
Italy (1943–1945) Romania (1944–1945) Finland (1944–1945) Bulgaria (1944–1945) Axis Powers Germany Italy (1940–43) Japan Affiliate states
Romania (1941–44) Hungary (from 1941) Bulgaria (1941–44) Thailand (1942–45) Client states
Slovakia Croatia Manchukuo Mengjiang Albania Co-belligerents
Finland (1941–44)
Iraq (1941)
Vichy France (1940–44) Active neutrality
Soviet Union (1939–41)
Spain (1941–44) Victory 1980 Liberian coup d'état (1980) Liberia Faction of the Armed Forces of Liberia Coup attempt succeeds First Liberian Civil War (1989–1997) Liberian government ULIMO (1991–1994)
LPC (1993–1996) LUDF (later becoming ULIMO ) LDF (1993–1996) Supported by: ECOMOG
UNOMIL (September 22, 1993 – September 12, 1997)
Anti-Doe Armed Forces elements NPFL INPFL (1989–1992) NPFL-CRC (1994–1996) Supported by: Libya Burkina Faso RUF NPFL Victory Sierra Leone Civil War (1991–2002) Defeat 1998 Monrovia clashes (1998) Liberian government (Taylor loyalists) Johnson's forces (ex-ULIMO-J )Limited involvement: Nigeria United States Partial victory of Charles Taylor Second Liberian Civil War (1999–2003) Liberian government RUF RDFG
Rebel groups: Guinea Sierra Leone Supported by : Ivory Coast United Kingdom United States
Rebel victory