European balance of power Austria which continued to rule as Holy Roman Emperor. Hapsburg Austria did directly control some states outside of the Holy Roman Empire. It was France who took the status of dominant continental power from the Habsburgs thanks to the Treaty of Westphalia and the Treaty of the Pyrenees. In the 16th and 17th centuries, English foreign policy strove to prevent a creation of a single universal monarchy in Europe, which many believed France or Spain might attempt to create. To maintain the balance of power, the English made alliances with other states—including Portugal, the Ottoman Empire, and the Netherlands—to counter
Nine-Power Treaty shown to be completely ineffective. During the Washington Naval Conference of 1921–1922, the United States government again raised the Open Door Policy as an international issue, and had all of the attendees (United States, Republic of China, Imperial Japan, France, Great Britain, Italy, Belgium, Netherlands, and Portugal) sign the Nine-Power Treaty which intended to make the Open Door Policy international law. The Nine-Power Treaty, concurrent with the Shangtung Treaty of the Washington Naval Conference, effectively prompted Japan to return territorial control of Shandong province, of the Shandong Problem, to the Republic of China. The Nine-Power Treaty was one of several