Britain and the First World War 1914–1918

The First World War transformed Britain more profoundly than any event since the Industrial Revolution. It expanded the state, empowered the labour movement, enfranchised women, destroyed the Liberal Party, and created the conditions for the welfare state. This lesson examines the political, social, and economic impact of the war on British society — analysing the historiographical debates about whether the war accelerated existing trends or produced genuinely revolutionary change.

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Britain's Entry into the War

Britain declared war on Germany on 4 August 1914, ostensibly in defence of Belgian neutrality under the 1839 Treaty of London. The Cabinet was deeply divided: two ministers resigned (John Burns and Lord Morley). Public opinion was initially uncertain but rallied rapidly.

Factor	Detail
Belgian neutrality	The German violation of Belgian neutrality provided the immediate moral justification
Balance of power	Britain's strategic interest in preventing any single power from dominating the European continent
Entente obligations	Informal commitments to France, including secret military conversations since 1906
Naval rivalry	The Anglo-German naval arms race had poisoned relations since 1898

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The Expansion of the State

The war required an unprecedented expansion of state power. The Defence of the Realm Act (DORA), passed on 8 August 1914, gave the government sweeping powers over almost every aspect of national life.

Area	Intervention
Conscription	Military Service Act (January 1916) — the first peacetime conscription in British history; extended to married men in May 1916
Industry	The Ministry of Munitions (established May 1915 under Lloyd George) controlled production, allocated raw materials, and directed labour
Food	Rationing introduced in early 1918 for sugar, meat, butter, and cheese; Ministry of Food established 1916
Transport	Railways brought under government control in August 1914
Alcohol	Pub opening hours restricted (a restriction that survived until 2005); beer diluted; the "No Treating Order" banned buying rounds
Propaganda	Wellington House (later the Department of Information) produced systematic propaganda

The Significance of State Expansion

The war demonstrated that the state could organise economic production, control resources, and manage social welfare on a scale that pre-war laissez-faire ideology had considered impossible and undesirable. This experience provided both the practical precedent and the intellectual justification for the expanded state of the post-war period.

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Political Change

The Fall of Asquith (December 1916)

The political crisis of December 1916 destroyed the Liberal Party as a governing force. Lloyd George, supported by the Conservatives and part of the Labour Party, replaced Asquith as Prime Minister. The Liberal Party split into Asquith and Lloyd George factions — a division that never healed.

Factor	Detail
Shell crisis (1915)	Reports of shell shortages on the Western Front discredited Asquith's management of the war
Coalition government (May 1915)	Asquith formed a coalition with the Conservatives and Labour — but tensions persisted
Lloyd George's ambition	Lloyd George used the proposed War Committee to marginalise Asquith, who resigned on 5 December 1916
Conservative support	Andrew Bonar Law and the Conservatives supported Lloyd George as a more dynamic war leader
Consequences	The Liberal split was permanent: Asquith's followers and Lloyd George's followers never reunited. The division enabled Labour's rise as the principal alternative to the Conservatives.