American exceptionalism

[message4u]

Hi all
Need your advice! I help some ABI students to improve their english.
Basically I thought that would be no problem for me, but in my last lesson
they brought some work sheets to learn for their next class test.
It is about "American exceptionalism, isolationism and interventionism"
Well, I have been trying to inform myself, but I do not even understand the
german explanation for that! Who is able to explain me these 3 words?
Look forward to receiving your reply.
Yvonne