How did the rise of Fascism and Nazism lead to the Second World War?

Italy wanted to revive the glory of the Old Roman empire. She joined the Anti-Comintern Pact in 1937 and formed a ten years alliance with Germany in 1939 to strengthen her position. Mussolini established dictatorship in Italy. Italy demonstrated her imperialistic designs by attacking Abyssinia.

In Germany, Hitler wanted to re-establish the prestige of Germany in the international field. He flouted the military clauses in the Treaty of Versailles and declared re-armament. In 1938, he annexed Austria and dismembered Czechoslovakia.

Thus, Mussolini and Hitler drove the countries of the world towards another World War.