Massive retaliation.
British foreign policy
The united states sought to expand its borders into Spanish territories.
The President of the United States has more influence over foreign policy than over domestic policy. Go on to explain both and then focus on foreign policy.
An attack made on another nation because it might attack you in the future
An attack made on another nation because it might attack you in the future
An attack made on another nation because it might attack you in the future
Isolation
Massive Retaliation
There is no "a" foreign policy. Every national political group - especially but not exclusively states - pursues it's own foreign policy. There has been countless stances of foreign policy before, during, and since World War One. You need to be more specific for a less general answer - say, inquiring about the foreign policy stance of the United States, or Russia, or some other nation.
The United States remained neutral in World War Two until Japan attacked Pearl Harbor.
WARS AND COVERT OPERATIONS