The last US declared war was WWII.
China did not start WWII. Japan was the aggressor in the Pacific and Germany in Europe. Japan invaded China in 1931, and the Chinese were badly defeated. The last Japanese army troops left China in 1945 at the end of the Second World war.
When you ask this question, are you referring to Red China or Nationalist China? Because there were TWO China's during the cold war time frame: Communist China headed by Mao & Nationalist China led by Chang Kai Shek.
Probably the First World War.
WW2 1945
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World WAr 2 was the last time Italy was at war officially.
Red China and Nationalist China (Taiwan) have probably been prepared for war for a long, long time.
The only time the US ever fought Red China was in the Korean War.
First was the war of 1812, last was WW2.
Beijing, China
The last US declared war was WWII.
Beijing, The Peoples Republic of China
The first US draft was during the US Civil War (1861-1865); the last US draft was during the Vietnam War (1961-1975).
The last summer Olympics were held August 2008 in Beijing China.