Answer:
Hitler's actions in invading the Rhineland was one of the events that caused the Second World War by breaking the peace treaty that had been signed at the end of the First World War.
Step-by-step explanation:
After the end of the First World War, the nations that were defeated, including Germany, had to sign the Versailles Treaty and take charge of paying the millionaire losses caused by the war. This made many German officials feel humiliated, a situation that Adolf Hitler took advantage of to promote his ideals and form the Nazi party.
Four years passed from the moment the Versailles Treaty was signed until Adolf Hitler organized the invasion of the Rhineland. This action went against the agreements of the Versailles Treaty, placing the allied countries in a position of what actions to take. This situation brought different consequences that would later end in the Second World War.
I hope this information can help you.