 Complete the following phrase:  In the late 19th century, China adopted the Western model of nation-state diplomacy. As the government of Tibet, China concluded several treaties 1876, 1886, 1890, 1893 with the British Indian government touching on the status, boundaries and access to Tibet. Chinese government sources consider this a sign of sovereignty rather than suzerainty. However, by the 20th century British India found the treaties to be ineffective due to Chinas weakened control over the Tibetan local government. A British expeditionary force 