In the Rush-Bagot Agreement, the United States and Britain agreed to substantially demilitarize the Great Lakes boundary between the US and British Canada, with each cutting their fleets to far fewer vessels. This was the first disarmament agreement made by the United States.
At the Washington Naval Conference, the United States, Britain, France, Italy, Japan, China, the Netherlands, Portugal, and Belgium signed an agreement recognizing China’s sovereignty and maintaining the Open Door policy.
The United States joined the military and economic committees of the Baghdad Pact, a defense alliance that included Britain, Iran, Pakistan, Turkey, and Iraq.
In World War I, the Allied forces were initially composed of Britain, France, Belgium, Serbia, and Russia, with Japan, Italy, the United States, and fifteen other nations joining the alliance before the war’s end.