of Díaz and a revolution that would continue for another ten years. In the U.S.'s Arizona Territory, two citizens were killed and almost a dozen injured, some as a result of gunfire across the border. Taft was against an aggressive response and so instructed the territorial governor. Nicaragua's president, José Santos Zelaya, wanted to revoke commercial concessions granted to American companies, and American diplomats quietly favored rebel forces under Juan Estrada. Nicaragua was in debt to foreign powers, and the U.S. was unwilling to let an alternate canal route fall into the hands of Europeans. Zelaya's elected successor, José Madriz, could not put down the rebellion as U.S. forces interfered, and in August 1910, the Estrada forces took Managua, the capital. The U.S. compelled Nicaragua to accept a loan, and sent officials to ensure it was repaid from government revenues. The country remained unstable, and after another coup in 1911 and more disturbances in 1912, Taft sent troops to begin the United States occupation of Nicaragua, which lasted until 1933. Treaties among Panama, Colombia, and the United States to resolve disputes arising from the Panamanian Revolution of 1903 had been signed by the lame-duck Roosevelt administration in early 1909, and were approved by the Senate and also ratified by Panama. Colombia, however, declined to ratify the treaties, and after the 1912 elections, Knox offered $10 million to the Colombians (later raised to $25 million). The Colombians felt the amount inadequate, and requested arbitration; the matter was not settled under the Taft administration. East Asia Due to his years in the Philippines, Taft was keenly interested as president in East Asian affairs. Taft considered relations with Europe relatively unimportant, but because of the potential for trade and investment, Taft ranked the post of minister to China as most important in the Foreign Service. Knox did not agree, and declined a suggestion that he go to Peking to view the facts on the ground. Taft considered Roosevelt's minister there, William W. Rockhill, as uninterested in the China trade, and replaced him with William J. Calhoun, whom McKinley and Roosevelt had sent on several foreign missions. Knox did not listen to Calhoun on policy, and there were often conflicts. Taft and Knox tried unsuccessfully to extend John Hay's Open Door Policy to Manchuria. In 1898, an American company had gained a concession for a railroad between Hakou and Sichuan, but the Chinese revoked