I do not see why....
No they aren't, US are very good friends with UK, it's how they both survived the World Wars. France might, but not the US.
They were the main Allies against the Nazis.
To thwart Germany's intentions - the UK were already at war against Germany, and by providing such information to the United States, they would ensure the US would be on their side.
That would be the American Revolution.
They fought with the Germans and Japanese against US, UK, USSR and France, Poland
if you mean world war 2 the us the UK an ussr would be examples.
A Korean Civil War would pit Koreans against Koreans.
Yes. Germany was the most powerful enemy against which the US fought in world war 2. (The first battle the US fought in the European Theater was in North Africa and it was against France. The US lost.)
The UK had to be somewhat "kind" (nice) to the US during that time frame, as the US was a major power with US military forces stationed in the UK and Germany during the cold war. So it was a good idea to retain proper attitudes towards one another during those times. But, the Britain (UK) did believe the US should get out of Vietnam. Australia & New Zealand, on the other hand, lived in the sphere of Vietnam, thus they felt abit different about the war. Britain wanted full concentration in Europe (NATO) during the cold war; just as in WWII...Britain did not like...(or feared) the US would concentrate too much on Japan and not Germany (thus endangering the UK..."Britain stands alone..." etc.). Consequently, any actions deverting the US from the UK was felt strongly against.
No. The US fought against Hitler. We were allies of the UK.
None that I know of.
The Zimmerman Telegram qualifies as such.