By the close of the 19th century, the United States was no longer a continental power, but had become a nation with interests that spanned the globe from the Caribbean to China. Consequently, the country faced a new set of strategic concerns, ranging from enforcing the Monroe Doctrine to defending the Philippines.
As a result of the United States” new geostrategic environment, the armed services had to establish a system for the creation of war plans to defend the country”s interests against possible foreign aggression. A Joint Army and Navy Board, established in 1903, ordered the creation of war plans to deal with real and potential threats to American security. Each major country was assigned a colour: Germany was Black, Great Britain Red, Japan Orange, Mexico Green and China Yellow. War plans were then devised in case Washington decided to use force against these or other powers.
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