Qatar has been ruled by the House of Thani since Mohammed bin Thani signed a treaty with the British in 1868 that recognised its separate status. Following Ottoman rule, Qatar became a British protectorate in the early 20th century until gaining independence in 1971. In 2003, the constitution was overwhelmingly approved in a referendum, with almost 98% in favour. In the 21st century, Qatar emerged as a significant power in the Arab world both through its globally expanding media group, Al Jazeera Media Network, and reportedly supporting several rebel groups financially during the Arab Spring. For its size, Qatar wields disproportionate influence in the world, and has been identified as a middle power. Qatar is currently the subject of a diplomatic and economic embargo by Saudi Arabia, the United Arab Emirates (UAE), Bahrain, and Egypt, which began in June 2017. Saudi Arabia has also proposed the construction of the Salwa Canal, which would run along the Saudi-Qatar border, effectively turning Qatar into an island.