In 1910, Northern Ireland (then part of the UK of Great Britain and Ireland) was the island's industrial powerhouse—a Protestant, unionist, manufacturing counterweight to the agrarian south. Belfast drove the economy.
Belfast dominated global linen production. Flax spun in water-powered then steam-powered mills (York Street, Brookfield, Ewarts). 50,000+ workers—mostly women and children in spinning; men in weaving, bleaching, finishing. Exports to Britain, Empire, USA. The Linen Hall (1783) set world prices.
World's largest shipyard (Queen's Island). 15,000+ workers. Built Olympic, Titanic, Britannic (1909–1914). Also warships, tankers, cargo liners. Ancillary industries: steel (David Colville), ropeworks, engine works (Workman Clark).
Textile machinery (McGeoch, Combe Barbour), tobacco (Gallaher), rope, distilling (Dunville's whiskey), food processing. Belfast's port handled 4M+ tons/year.
County Down, Antrim, Armagh, Londonderry: mixed farming (cattle, dairy, oats, potatoes). Linen relied on local flax (declining, replaced by Russian/Belgian imports). Land tenure: tenant farmers on large estates (Marquess of Donegall, Londonderry).
Sectarian segmentation: Protestants—skilled trades, shipyard, management. Catholics—unskilled labor, dock work, mill "roughing." Trade unions: Craft-based (shipwrights, engineers), then general (Dockers, 1907 Larkin strike). Child labor: Half-timers (school + mill) legal until 1920.
WWI transformed everything: Shipbuilding surged (Admiralty orders, conversion yards). Linen boomed (aircraft fabric, uniforms, sandbags). Men enlisted (36th Ulster Division, 16th Irish Division—both shattered at Somme, 1916). Women flooded factories. Partition loomed (Home Rule crisis, UVF gunrunning).
A society at peak industrial confidence, deeply divided, about to be reshaped by war and partition. The "Ulster" economy—integrated into British imperial networks—would never be the same.