The Japanese invasion of Manchuria in 1931The invasion of Abbysinia by Italy in 1935The re-militarisation of the Rhineland by Germany in 1936All these were aggressive actions, but whether they threatened world peace is debatable.
The weakness and un willingness of the european powers and others to react and commit to military actions as a result of the first world war
Germany invaded Poland and France decided to abandon the policy of appeasement and break the Munich Agreement due to Hitler's aggressive actions.
Germany was considered a negative influence during World War 1 due to its aggressive military actions, alliances with other powerful nations, and role in sparking the conflict through its invasion of Belgium and other countries.
Hitler tried to take over the world and slaughtered many innocent Jews.
Appeasement Policy
The League of Nations existed before the United Nations but fell apart with the start of the second World WAr.
The pact that stated the unified hope for world peace and outlawed aggressive actions of war is the Kellogg-Briand Pact, formally known as the Pact of Paris, signed in 1928. It was an agreement between multiple nations that aimed to renounce war as a means of resolving disputes and sought to promote peaceful coexistence. Although it was a significant step towards international diplomacy, the pact lacked enforcement mechanisms and ultimately proved ineffective in preventing future conflicts.
Before and during World War II, both Japan and Germany pursued aggressive expansionist policies aimed at territorial growth and domination. Japan invaded China and sought to expand throughout Asia, while Germany aimed to establish a Greater German Empire by annexing neighboring countries. Both nations employed militarism and totalitarian governance, suppressing dissent and promoting nationalism. Their actions led to widespread conflict, resulting in significant loss of life and contributing to the global scale of the war.
I don't know if you have noticed, but before the United Nations there were wasn't that much peace.
The League of Nations was disbanded before World War ll, while the United Nations continues to operate in the 21st century.
His actions involved growing Germany's military, creating air forces, and expanding land that was taken away from them.