On 8 January 1820, Sheikh Sultan I signed the General Maritime Treaty with Britain, accepting a protectorate to keep the Ottoman Turks out. Like four of its neighbours, Ajman, Dubai, Ras Al Khaimah, and Umm Al Quwain, its position on the route to India made it important enough to be recognised as a salute state (be it of the lowest class: 3 guns). In 1829, English author and traveler James Silk Buckingham described Sharjah as such: By the turn of the 20th century, Sharjah extended inland to the area now known as Wasit Suburb, the area between the city and Dhaid being under the control of the tribes of the interior. With some 15,000 inhabitants, Sharjah had some 4 or 5 shops in Layyah and a bazaar of some 200 shops in Sharjah proper. At the height of World War II, Nazi propaganda infiltrated the town. Loud transmissions of pro-Hitler speeches could be heard emanating from the Sheikh of Sharjah's palace during a period in 1940, and messages sharing a similar sentiment had been graffitied on walls in the town centre according to British intelligence reports at the time. Because the message being propagated by the Germans was one of anti-Imperialism, it found a sympathetic audience among the emirate's populace, particularly Abdullah bin Faris, a secretary of the Sheikh who was responsible for the broadcasts. After the Sheikh was confronted by the British, he wrote a letter reiterating his support for the British war efforts and disputed the charges laid out against bin Faris. Attached to the letter was a petition signed by 48 prominent individuals testifying to bin Faris' character, which, according to the British, had been misrepresented to the signees. The incident resolved after the Sheikh and bin Faris ceased from transmitting propaganda and doubled down on their support of the British. On 2 December 1971, Sharjah, together with Abu Dhabi, Dubai, Ajman, Umm Al Qawain and Fujairah joined in the Act of Union to form the United Arab Emirates. The seventh emirate, Ras Al Khaimah, joined the UAE on 10 February 1972, following giant non-Arab neighbour Iran's annexation of the RAK-owned Tunbs islands. Like the other former Trucial States, Sharjah's name is known by many stamp collectors because of the large numbers of stamps that were issued by the Sharjah Post Office shortly before the formation of the United Arab Emirates, which became part of the class of virtually worthless stamps known to collectors as Dunes.