How did the war against germany and united states started?

Question

How did the war against germany and united states started?

Answer 1

Germany declared war on the United States after the U.S. declared war on Germany's ally Japan.

Remember the Axis,Germany,Italy,and Japan.

Answer 2

After the US declared war on Japan following the Pearl Harbor attack, Hitler declared war on the US.  We had been assisting Britain all along so it was no surprise.

Answer 3

If I remember correctly, Hitler was doing the holocaust thing.

And America found out.

Answer 4

The US Navy began answering distress calls from ships hit by U-boats in the North Atlantic while the US was sending materiel to UK. If they weren't actually performing convoy duty, it was a good imitation. Inevitably, in the spring and summer of 1941, the US Navy and the Kriegsmarine began taking pot shots at each other. This was kept secret from the American public. Then, two days after Pearl Harbor, for reasons still nobody understands, Germany declared war on the US.