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Extraterritoriality is the state of being exempt from the jurisdiction of local law, usually as the result of diplomatic negotiations. Extraterritoriality can also be applied to physical places, such as embassies, consulates, or military bases of foreign countries, or offices of the United Nations. These places are the sovereign territories of the home country, and although they are not subject to local law, local law enforcement agencies do have the duties of protecting them from outside disturbances and can in some cases arrest a person there for crimes committed on the host state's soil.

The three most common cases recognized today internationally relate to the persons and belongings of foreign sovereigns, the persons and belongings of ambassadors and certain other diplomatic agents, and public ships in foreign waters.

Extraterritoriality is often extended to friendly or allied militaries, particularly for the purposes of allowing that military to simply pass through one's territory.

Extraterritoriality can also refer to the extension of the power of a nation's laws to its citizens abroad. For example, if a person commits homicide abroad and goes back to his country of citizenship, the latter can still try him under its own laws, although this is likely to involve transfer of evidence and other judicial information.

During the thirteenth and fourteenth centuries, the Italian sea republics of Genoa and Venice managed to wrestle extraterritoriality for their quarters (Pera and Galata) in the Byzantine capital, Constantinople.^{[citation needed]} They even battled among themselves for further control of the weakened empire.

Perhaps the most well-known cases of historical extraterritoriality concerned European nationals in 19th century China and Japan under the so-called unequal treaties. Extraterritoriality was imposed upon China in the Treaty of Nanking, resulting from the First Opium War. Shanghai in particular became a major center of foreign activity, as it contained two extraterritorial zones, the International Settlement and the French Concession. These extraterritorialities officially ended only after the end of World War II.

Japan recognized extraterritoriality in the treaties concluded with the United States, the United Kingdom, France, Netherlands, and Russia in 1858, in connection with the concept of "Most Favored Nation."^[1] However, Japan succeeded in reforming her unequal status with Western countries through the Anglo-Japanese Treaty of Commerce and Navigation signed on July 16, 1894 in London.

Extraterritoriality in China for non-diplomatic personnel ended at various times in the twentieth century. Germany and Austria-Hungary lost their rights in China in 1917 after China joined the allies in World War I; the Soviet Union gave up its rights in China in 1924; the United States and United Kingdom gave up their rights in 1943; Italy and Japan gave up their rights by virtue of being at war with China in World War II; and France was the last country to give up its rights, in 1946.

Thailand signed a treaty granting extraterritorial rights to Britain in 1855 during the reign of King Rama IV.^[2] Unequal treaties were later signed with 13 other European powers, as well as Japan. After the absolute monarchy was overthrown in 1932, the constitutional government promulgated a set of legal codes, setting the stage for new treaties signed between 1937 and 1938 which canceled extraterritorial rights.^[3]

The Treaty Ports in Ireland, which were sovereign bases created by the United Kingdom in 1922, did not enjoy extraterritoriality from the Irish Free State.^{[citation needed]} They were instead pieces of sovereign territory retained by the United Kingdom, until they were finally ceded to the Free State in 1938.

• Diplomatic immunity
• Official visits of heads of state
• Extraterritorial Properties of the Holy See such as the papal summer residence, Castel Gandolfo
• Headquarters of the Sovereign Military Order of Malta in Rome.
• United Nations headquarters in New York, United Nations offices in Geneva, Vienna, Nairobi, The Hague (International Court of Justice) and elsewhere.
• The International Bureau of Weights and Measures at the Pavillon de Breteuil in Sèvres.
• The NATO (political) headquarters in Brussels and the headquarters of Allied Command Operations, SHAPE outside Mons, Belgium.
• CERN (European Organization for Nuclear Research)

• Rasul v. Bush
• International zone
• Imperialism in Asia
• Harris Treaty
• Most Favored Nation
• Unequal Treaties
• Embassy
• Demilitarized zone
• Neutral territory
• EuroAirport Basel-Mulhouse-Freiburg
• Antarctic Treaty System
• Law of the Sea
• Outer Space Treaty
• Moon Treaty
• International waters
• Status of Forces Agreement

• Columbia Encyclopedia – Extraterritoriality
• The Knox-Castrillo Treaty
• Shih Shun Liu, Extraterritoriality, Its Rise and Its Decline (1925)