During the war, the three governments in exile signed a customs convention between their countries.

In 1944, the three countries signed the London Customs Convention, the treaty that established the Benelux Customs Union.

It had passed, since the war, two measures of importance - one (1902) restricting alien immigration, the other (1903) ratifying the first customs convention between all the South African colonies.

As the result of an inter-colonial conference held in Pietermaritzburg in the early months of 1906, a new customs convention of a strongly protective character came into force on 1 June 1906.

The presidency needs to produce some sort of strategy to bring an end to the existence within the European Union of parallel data protection systems and the proliferation of monitoring authorities - for example Schengen, Europol or customs conventions.

In an interview with the Russian news agency ITAR-Tass, King Abdullah emphasized that he also hoped the two nations could expand cooperation on investment, air transportation and customs conventions as well as scientific and educational exchanges.

In May 1908, the Orange River Colony took part in an inter-state conference which met at Pretoria and Cape Town, and determined to renew the existing customs convention and to make no alteration in railway rates.