The First World War was the turning point for the economy of Northern England. In the interwar years, the Northern economy began to be eclipsed by the South – in 1913–1914, unemployment in "outer Britain" (the North, plus Scotland and Wales) was 2.6% while the rate in Southern England was more than double that at 5.5%, but in 1937 during the Great Depression the outer British unemployment rate was 16.1% and the Southern rate was less than half that at 7.1%. The weakening economy and interwar unemployment caused several episodes of social unrest in the region, including the 1926 general strike and the Jarrow March. The Great Depression highlighted the weakness of Northern England's specialised economy: as world trade declined, demand for ships, steel, coal and textiles all fell. For the most part, Northern factories were still using nineteenth-century technology, and were not able to keep up with advances in industries such as motors, chemicals and electricals, while the expansion of the electric grid removed the North's advantages in terms of power generation and meant it was now more economic to build new factories in the Midlands or South.