Belfast was founded in 1177 when a castle in defense of a ford over the Lagan was built, but the present city is a product of the Industrial Revolution. French Huguenots, coming there after the revocation of the Edict of Nantes (1685), stimulated the growth of the town's linen industry. Serious rioting between Catholics and Protestants, who live in distinct sections of the city, has scarred Belfast many times since the 19th cent.; sectarian terrorist violence was a significant problem in the late 20th cent. The city and the surrounding country were subjected to heavy air raids in 1941. Belfast suffers from high unemployment, and its population has decreased markedly due to the violence and the planned economic development of outlying areas.
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