What Is 20th century in Wales

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Last updated: April 15, 2026

Quick Answer: The 20th century in Wales was marked by industrial decline, cultural revival, and political devolution, with coal production peaking in 1913 at over 256 million tons and the National Assembly for Wales established in 1999.

Key Facts

Coal production in Wales peaked in 1913 at 256 million tons, making it a global leader in coal exports.
The 1926 General Strike saw over 200,000 Welsh miners participate in solidarity with other UK workers.
Welsh language speakers declined from 43% in 1911 to under 20% by 1981 due to urbanization and migration.
The National Assembly for Wales was created in 1999 following a 1997 referendum where 50.3% voted in favor.
The closure of the Welsh coal industry in the 1980s led to unemployment exceeding 12% in some valleys regions.

Overview

The 20th century in Wales was a period of dramatic transformation, transitioning from a global industrial powerhouse to a post-industrial society focused on cultural identity and self-governance. At the start of the century, South Wales was central to the British Empire’s coal economy, fueling ships and factories worldwide.

By the century’s end, deindustrialization had reshaped the economy, while movements for linguistic and political autonomy gained momentum. These shifts were driven by global economic changes, labor struggles, and a reawakening of Welsh national consciousness.

1913 peak coal output: Wales produced 256 million tons of coal, the highest in its history, primarily from the South Wales Coalfield.
1926 General Strike: Over 200,000 Welsh miners joined the UK-wide strike, which failed but left a lasting legacy of labor solidarity.
Decline of the Welsh language: The proportion of Welsh speakers dropped from 43% in 1911 to 18.9% in 1981 due to migration and English dominance.
1948 National Health Service: The NHS was launched in Wales as part of the UK, with Aneurin Bevan, a Welsh MP, as its chief architect.
1999 devolution: The National Assembly for Wales was established after a narrow referendum victory, marking a new era in Welsh governance.

Major Developments and Their Impact

Throughout the 20th century, Wales experienced profound social, economic, and political shifts that redefined its national identity. Industrialization gave way to deindustrialization, and cultural revival efforts countered decades of assimilation.

Post-WWII nationalization: The Coal Industry Nationalisation Act of 1946 brought Welsh mines under public ownership, aiming to stabilize the sector.
1984–85 Miners' Strike: Led by Arthur Scargill, the strike failed, and by 1994, only one deep mine remained in Wales.
1961 census milestone: For the first time, more people in Wales spoke only English than bilingual or Welsh-dominant speakers.
1979 devolution referendum: A proposal for a Welsh assembly was rejected by 79.7% of voters, reflecting skepticism at the time.
1993 Government of Wales Act: This legislation laid the groundwork for devolution, eventually leading to the 1999 Assembly.
1996 Welsh Language Act: Gave Welsh equal status with English in public services, promoting linguistic revival.

Comparison at a Glance

Key developments in 20th-century Wales compared across decades:

Decade	Economic Focus	Political Milestone	Language Trend	Population (approx.)
1900–1910	Coal and steel dominance	Welsh Church Act 1914 passed	43% spoke Welsh (1911)	2.4 million
1920–1930	Post-war industrial decline	1926 General Strike	Gradual language decline	2.7 million
1940–1950	War production, nationalization	NHS founded by Aneurin Bevan (1948)	37% Welsh-speaking (1951)	2.8 million
1960–1970	Deindustrialization begins	Plaid Cymru wins first seat (1966)	26% Welsh-speaking (1971)	2.9 million
1980–1990	Mass mine closures	1979 and 1997 devolution referenda	18.9% (1981)	2.8 million
1990–2000	Shift to service economy	National Assembly established (1999)	20.8% (2001)	2.9 million

This table illustrates how economic shifts, political changes, and language trends evolved in parallel. While coal powered early-century growth, its decline catalyzed cultural and political renewal by the 1990s.

Why It Matters

The 20th century laid the foundation for modern Wales, shaping its institutions, identity, and place within the UK. Understanding this era is essential to grasping contemporary Welsh society.

Cultural revival: The Welsh Language Society (Cymdeithas yr Iaith) founded in 1962, pushed for official status and education rights.
Economic transition: Former industrial areas shifted to service, tourism, and tech sectors by the 2000s.
Political empowerment: Devolution allowed Wales to pass laws on health, education, and transport independently.
Education reforms: Welsh became a compulsory subject in schools from ages 5–16 starting in the 1990s.
Media development:S4C, the Welsh-language TV channel, launched in 1982, boosting language visibility.
Legacy of labor: Trade unions from the coal era evolved into modern advocacy groups for workers’ rights.

The 20th century in Wales was not just a story of decline, but of resilience and reinvention. From industrial might to cultural resurgence, its legacy endures in today’s self-governing, bilingual nation.