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In page Casablanca:

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In the 19th century, the area's population began to grow as it became a major supplier of wool to the booming textile industry in Britain and shipping traffic increased (the British, in return, began importing gunpowder tea, used in Morocco's national drink, mint tea).[1] By the 1860s, around 5,000 residents were there, and the population grew to around 10,000 by the late 1880s.[2] Casablanca remained a modestly sized port, with a population reaching around 12,000 within a few years of the French conquest and arrival of French colonialists in 1906. By 1921, this rose to 110,000,[3] largely through the development of shanty towns.[citation needed]