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The US Civil War was an un-declared war.
The US did enter into an undeclared shooting war with Germany in the fall of 1941 because Germany has declared war on the US.
After Japan bombed Pearl Harbor we declared war on them. Germany was an ally of Japan so they declared war on us. Italy was an ally of Germany so they went along with Germany and declared war.
The American Civil War (US Civil War) was not a declared war.
According to Article 1, Section 8 of the Constitution, Congress has the power to declare war. But the President is the commander-in-chief of the armed forces.