Someone who does not believe in participating in war is known as a Pacifist. They believe that war and violence are unjustifiable and that disputes between nations can and should be settled peacefully.
Civil War Glossary -A- abolitionist A person opposed to slavery" more information is available on docstoc.
Pacifist.
pacifist
non-sexual
patrioctic.
A anti-social
a treekiller or just plain stupid
frugal miserly stingy skimpy parsimonious
A liberal.
A person who hates conflict is often referred to as conflict-averse or peace-loving.
A person who hates all foreigners is typically referred to as a xenophobe.
an introvert
non-sexual
Xenophobic
patrioctic.
Maybe a 'homebody'.
A misanthrope
misanthrope
It is called 'pacifism'
Either an Audiophobe or a Melophobic