United States didn't have the resources to fight a two-front war. As a result of this, it was decided that one front should be prioritized for offense while the other was to be defensive, for war against British territories in North America and the Atlantic and against Britain and Japan in the Pacific respectively. This decision resulted in the Plan Dog memo during World War II, replacing Britain with Germany and Italy instead. War Plan Yellow Dealt with war in China—specifically, anticipating a repeat of the Boxer Uprising (1899–1901). War Plan Yellow would deploy the US Army in coalition with other imperial forces to suppress indigenous discontent in the Shanghai International Settlement and Beijing Legation Quarter, with chemical weapons if necessary. War Plan Gold Involved war with France, and/or France's Caribbean colonies. War Plan Green Involved war with Mexico or what was known as "Mexican Domestic Intervention" in order to defeat rebel forces and establish a pro-American government. War Plan Green was officially canceled in 1946. War Plan Indigo Involved an occupation of Iceland. In 1941, while Denmark was under German occupation, the US actually did occupy Iceland, relieving British units during the Battle of the Atlantic. War Plan Purple Dealt with invading a South American republic. War Plan Violet Covered Latin America. War Plan White Dealt with a domestic uprising in the US, and later evolved to Operation Garden Plot, the general US military plan for civil disturbances and peaceful protests. Parts of War Plan White were used to deal with the Bonus Expeditionary Force in 1932. Communist insurgents were considered the most likely threat by the authors of War Plan White. War Plan Blue Covered defensive plans and preparations that the United States should take in times of peace. References Further reading External links 1935 Invasion, War Plan Crimson Color codes Foreign relations of the United States 20th-century military history of the United States Military plans