Linked from
The 15 pages that link to Opium trade, each with the reason it gives.
MorphineRelated: Morphine emerged from a drug whose trade had already reshaped global politics.
Treaty of NankingRelated: The trade and Qing efforts to suppress it helped precipitate the war.
Black marketRelated: Restrictions on opium helped drive some trade into clandestine channels.
James MathesonRelated: Opium was a major commodity in the firm’s early China trade.
HowquaRelated: Its growth destabilized the commercial order in which Howqua had prospered.