In the spring of 1945.
Germany fought the us in world war 1
No Germany declares war on US
Germany
Germany
germany
The US declared war on Germany, hour after Germany declared war on the US on December 11, 1941.
Germany declared war on the US after Pearl Harbour.
On September 13, 1944 the US troops reach the Siegfried Line in western Germany. They crossed that line and entered Germany. I have added a related link for you in case you want to read more about it. You can see the story of this crossing in the show the Last Days of World War II.
The US declared war on Germany on Dec 11th 1941, (two days after Germany declared war on the US). Everything since that date to the present is after.
The US did enter into an undeclared shooting war with Germany in the fall of 1941 because Germany has declared war on the US.
Germany
No. Germany did have spies inside of The US but they never really do much harm until Battle of the Bulge.