A passport is a travel document, usually issued by a country’s government, that certifies the identity and nationality of its holder primarily for the purpose of international travel. Standard passports may contain information such as the holder’s name, place and date of birth, photograph.
Where a country does not recognise another, or is in dispute with it, it may prohibit the use of their passport for travel to that other country, or may prohibit entry to holders of that other country’s passports, and sometimes to others who have, for example, visited the other country.
The general reaction was the relaxation of passport requirements.In the later part of the nineteenth century and up to World War I, passports were not required, on the whole, for travel within Europe, and crossing a border was a relatively straightforward procedure.
These controls remained in place after the war, becoming a standard, though controversial, procedure.
In 1920, the League of Nations held a conference on passports, the Paris Conference on Passports & Customs Formalities and Through Tickets.
Passport standardization came about in 1980, under the auspices of the International Civil Aviation Organization (ICAO).
However, legal scholars including A.J. Under some circumstances some countries allow people to hold more than one passport document.