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IBDP HL History 20th Century Wars notes on WW1 and WW2

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Extensive notes on IBDP HL History 20th century wars of WW1 (European theatre) and WW2 (Pacific theatre). Includes Causes of War, Practices of War and Effects of War. Includes essay pointers and historical perspectives.

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20th Century Wars
World War One - european theatre World War Two - pacific theatre
=> Militarization of Economies => Japan’s resource dependency
Short term Econmic - Countries devoted larger shares of GDP - Japan has few natural resources
Causes of War to expanding navies + armies - Japan relied on imports to fuel
- Eg. By 1914 over 35% of German GDP = military-industrial complex
military. Compared to 13% in 1906. - Japan had little raw materials needed to
- Amplied security dilemmas as neighbors produce armaments eg aluminium, rubber, tin
spent more = keeps increasing etc.
Link: Spending fueled arms races, difficult to halt - Sanctions threatened to cripple economy +
due to concerns of security - geared country military capabilities
towards a war - Over-reliance of trade = Increased fears of
economic vulnerability of foreign powers
=> Dependence on Raw Material Exports Link: This reliance of trade made japanese more
- Germany + Britain relied on overseas economically vulnerable. It is what made sanctions
trade flows for eg. cotton, rubber, foods. (below point) effective in japanese pursuit of more
- Eg. By 1913 Germany imported 27% of aggressive/urgent expansionist aims
good from overseas = cutoff threatened
unrest => Germany backed Austria’s war
on Serbia to preserve alliance system => Western economic sanctions/embargoes
- British empire relid on command of - Japan’s aggressive expansionism in China +
global shipping lanes southeast asia = US implemented sanctions
Link: Revealed how vulnerable countries were - vital resource imports eg. oil, iron, steel to
could be exploited, commerical interests are Japan.
crucial to preserve. - Lack of resources = threat to functioning of
wartime economy
HP. Saul => economic stakes of imperialism - At the time Japan imported over 80% of oil at
impacted diplomacy, more to loose by backing the time = sanctions cut hindered fleet almost
down immedietly
- US supplied over 90% of japan’s aviation
gasoline = impacted air force to a halt
- July 1941 = US/UK froze japanese assets
Link: Sanctions limited Japan’s access to necessary
raw materials to fuel their expansionist aims - created
solution of more aggressive expansion in asia to
acquire colonies’ raw materials

HP. Japan began a drive for expansionism due to its
industrialization outpacing domestic supplies

, => Militarism => Japanese Militarism
Ideological - European countries began to glorify - Kodoha faction within Army were pushing for
military strength - pursuit of aggressive totalitarian military state + removal of
defense policies involving large conscript parlimentary democracy = expansionst goals
- More moderate civilian leaders were replaced
armies
with Militarists eg. Tojo = prioritized army’s
- More ‘war party’ factions gained
agenda over other concerns in policymaking
influence - belief that conflict inevitable - After acquring Manchuria = Kwantung Army
- Eg. War plans acted more independently of Tokyo - set
- All euorpean made war plans precedent that military could determine
regarding what they would do in strategy more
the event of a war breaking out - Eg. Pearl harbour
- German Schlieffen plan = While - Attack on the US to destory air craft
Russia was mobilising - invade carriers to diffuse threat of US
presence in pacific that would have
France through Beligum, Holland
undermined japanese success
and Luxembourg (to pass
- US imposed trade sanctions +
German-French border embargo eg. Oil
defenses). Then encircle paris - Gov negotiations with US - Hull note
after capture and move to meet said to withdraw forces in China
mobilised russian troops along - More agressives acts
eastern front - Eg. Manchuria
- France = Plan 17 - high speed - Increasing power of military = attack
mobilisation + capture of Alsance devised by Kwantung Army
and Lorraine - Had not been part of gov policy but
- Russia = plan to attack AH and was accepted
Germany - Shows more presence of militarism in
- AH = Pan R and Plan B - different foreign policy
in allocation of troops to fight Link: ultranationalist permeated politics and society -
Russia/Serbia led to gov to pursue aggressive militarist factions
Link: Nationalism als opermeated politics + pushing for rapid expansion etc.
society = pursuit of aggressive militarist actions
for security and ambition.
=> Racial Ideology
=> The July Crisis (immediate cause) - - More propaganda spreading notions of racial
superioirty + divine emperor worship through
natioonalism
textbooks + public speeches
- June 28 1914 = Gavrilo Princip (Blank
- Eg. Pamphlets such as ‘Japan’s Mission in
Hand movement) (serb), shot Asia’ = portrayed invasion of China + vision of
‘Co-Prosperity Sphere’ - almost ‘racial

, Austro-Hungarian Archduke Franz empowerment
Ferdinand in Bosnia. Link: more theories of japanese racial supremacy +
- Serbs in Bosnia resented Austria’s divine right to subjugate other asians. Used to
annexation of region in 1908 - wanted legiitimized oppression of acquired territories.
Bosnia to join the independent country of
HP. Young => racial supremacism drove Japan’s
Serbia
determination to control Asia
- AH. saw opportunity to crush Serbia as
they were weak and still recovering from
Balkan Wars - hesitant as attack on
Serbia = Russia involvement => sought
assurance from Germany
- Germany gave Austria ‘blank cheque’
guaranteeing unconditional support
- Ultimatum sent to Serbia from AH -
rejection of a term = excuse for invasion
=> Mobilisation of Russia, German,
French, and British Troops => War
Link: Slav nationalism triggered an outburst that
resulted in the july crisis which led to WW2

HP. Fischer => German leadership saw stopping
Serbian independence as ideologically crucial to
control Central Europe - thus Slav nationalist
challenged German dominance heightening
tensions




=> Failures of Diplomacy - July 1914 Crisis => Tripartite Pact between Japan, Germany and Italy
Political - Various courties opposition to diplomatic 1940
intiatives failures as they all had their - Aligned Japan with the expansionist Axis and
own aims weakened previous cooperation with the west
- Eg. of diplomatic solution during JUly - Rasied concerns for allies by formalizing
Crisis = communications between gov & Japan with two aggressive powers threatening
kaiser/tsar western colonies
- July 1914 Kaiser sent several
telegrams to Tsar telling him to

, back down from his support to Link: Japan more closely linked to axis powers +
Serbia - suggestion of territorial aggression, exacerbating tensions with the
cooperation to prevent wider US and allies.
conflict. Tsar commited to Serbia.
Efforts were half-hearted. => Japan’s occupation of French Indochina
- Germany was pursuing a policy of - Seen as a provocative act that threatened
‘calculated risk’ - rejection of diplomacy western colonial interests in southeast asia
and small steps to accumulate in german - Led to increased sanctions and embargoes on
escalation = opposition to diplomatic Japan
initiatives. - This movement cut supply lines to nationalist
- Germany assumed that Russia, China = alarmed western interests
France, and Britain would not - Seen as attempts to capitalize on europe’s
intervene - thus, taking small distraction and expand control of
aggressive acts - eg. blank resources/influence
cheque to AH. - Provoked US oil and steel embargos
- Blank cheque = ambiguous Link: Created more political tensions and tone of
wording leaving room for uncertainity to provoke
misinterpretation = calculated risk
in trusting AH AND assuming that HP. Willmott => Japan’s alignment with Axis allies
allies would not retaliate. pulled it towards war, cutting off other choices for
- Immediate consequences of failure of diplomacy.
diplomacy = outbreak of war
Link: Diplomacy was alwasy half-hearted or
defused with own desires - led to attempts for
long-term peace.

HP. Hamilton => At the time in most nations real
political power was concentrated among
militaristic elites rather than populations less
keen for war - which made negotiations to
prevent a war even more hard - failures of
democracy

=>Escalatory arms race
- Increase in armament expenditure -
suspicion by rivals - atmosphere of
mutual fear and suspension - created a
mood for war in 1914

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