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The last time the United States officially declared war on another country was in 1941, Franklin D Roosevelt called for war with Japan after the December 7th Pearl Harbor bombing. Vietnam, Korea, Afghanistan are all considered "extended military engagements".

The declaration of War against Japan in 1941 was the last time the congress exercised its constitutional power to declare war.

Let understand that Executives officials (President, Governors) does not only hold the power to declare war. The United state constitution grants the Legislative (Congress) some non-legislative power such as declaration of war.

The last time the congress officially declared war on another country was during WW2 in 1941.

Therefore, the declaration of war against Japan was the last time the Congress exercise such action, rather since then, they agreed to resolutions through use of military force or other means

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