How many atomic wars has this society experienced? how do the people react to the wars?This question is taken from Part II the sieve and the sand

There have been two atomic wars since 1990, and it is
implied that Montag's country emerged from those wars relatively unscathed, as Montag
muses that the rest of the world hates his country for its superior position, which it
gained through cruelty and narcissism. The impact of those atomic wars on the people in
this society is not detailed, but it seems to have contributed to the society's
rejection of books and thought, and addiction to thrills that take up all the time that
might otherwise be spent in melancholy thoughts. The disasters of the previous atomic
wars and the gradual deteroriation of life overall seem to have led society to embrace
anything that would prevent it from reflection.