A principality in central Europe between Switzerland and Austria. Liechtenstein, founded in 1719, became a sovereign state in 1806, and became independent in 1866. Until 1918, it retained close ties with Austria, which until 1920 operated the Liechtenstein postal service. Since 1920, it has been associated with Switzerland, its post office having been under Swiss administration since 1921. In 1868, Liechtenstein abolished its army and has since remained free of foreign entanglements. Liechtenstein is one of the major tax havens of the world, and many international corporations have headquarters there. The country's major exports include postage stamps and plastic postage stamp mounts.