In 
Mein Kampf, Hitler used the main thesis of "the Jewish peril", which speaks of an alleged Jewish conspiracy to gain world leadership.
[6] The narrative describes the process by which he became increasingly 
anti-semitic and 
militaristic,
especially during his years in Vienna. Yet, the deeper origins of his 
anti-semitism remain a mystery. He speaks of not having met a Jew until 
he arrived in Vienna, and that at first his attitude was liberal and 
tolerant. When he first encountered the anti-semitic press, he says, he 
dismissed it as unworthy of serious consideration. Later he accepted the
same anti-semitic views, which became crucial in his program of 
national reconstruction.
Mein Kampf has also been studied as a work on 
political theory. For example, Hitler announces his hatred of what he believed to be the world's twin evils: 
Communism and 
Judaism.
The new territory that Germany needed to obtain would properly nurture 
the "historic destiny" of the German people; this goal, which Hitler 
referred to as 
Lebensraum
(living space), explains why Hitler aggressively expanded Germany 
eastward, specifically the invasions of Czechoslovakia and Poland, 
before he launched his attack against Russia. In 
Mein Kampf Hitler openly states that the future of Germany "has to lie in the acquisition of land in the East at the expense of Russia."
[7]
In his work, Hitler blamed Germany’s chief woes on the 
parliament of the 
Weimar Republic, 
the Jews, and 
Social Democrats, as well as 
Marxists. He announced that he wanted to completely destroy the 
parliamentary system, believing it in principle to be corrupt, as those who reach power are inherent 
opportunists.