The partitioning of India formally came into effect on 14 August 1947, dividing the provinces of Bengal (with East Pakistan, now Bangladesh) and Punjab (with West Pakistan, now Pakistan proper) to create a separate nation (from India) as outlined by the Pakistan Movement, which advocated the "Two-Nation Theory" — that Muslims and Hindus cannot sustain a nation together because of religious differences that would prove too difficult to compromise on or, in some cases, simply impossible to reach a mutual consensus on. The partition provoked great communal conflicts and shortly afterwards, a major dispute over the territory of Kashmir (a former princely state under the British Raj which was sovereignly claimed in full by both the Dominion of India and Dominion of Pakistan) sparked a large-scale war between the two neighbouring countries. India and Pakistan have, since their independence, engaged in four armed conflicts against each other (1947, 1965, 1971, 1999), all of them stemming from their disputes in Kashmir with the exception of the war in 1971. However, some diplomatic efforts have succeeded in promoting bilateral trade and sports events between the two nations as well as permitting Indians and Pakistanis to peacefully cross the border and visit through services provided by the Samjhauta Express and the Delhi-Lahore binational bus route. The 1972 Shimla Agreement and subsequent bilateral accords have bound both nations to seek a peaceful solution to the Kashmir conflict while promoting trade and economic cooperation.