Treaty of Aigun
Many of the other treaties China considers unequal were repealed during the Second Sino-Japanese War, which started in 1937 and merged into the larger context of World War II. The United States Congress ended American extraterritoriality in December 1943. Significant examples did outlast World War II: treaties regarding Hong Kong remained in place until Hong Kong's 1997 handover, and in 1969, to improve Sino-Soviet relations in the wake of military skirmishes along their border, the People's Republic of China reconfirmed the 1858 Treaty of Aigun.