After WW1 all of the countries formed the league of nations and kept Germany out of it because the other countries decided it was Germanys fault that the war started.
Adolf Hitler reached out to Joseph Stalin and told him his plan to invade Poland on September 1st and all he needed was the soviet union to stay out of the way and after Hitler succeeded he would give the Soviets the land they loss after WW1.
Japanese expansion in east Asia began in 1931 with the invasion of Manchuria and continued in 1937 with a brutal attack on china on September 27, 1940.
The Great Depression was a worldwide economic depression that took place mostly during the 1930s .
In facist Italy and nazi Germany, both Mussolini and Hitler both pursued territorial expansion.
Hitler basically made a plan to take over the entire world and it was working until the US joined the war but his plans started way back before the beginning of WW2.