On which ways did river Nile contribute to the development of early agriculture in Egypt?

Here are five causes of the Second World War:

• Treaty of Versailles: The harsh terms imposed on Germany after World War I led to resentment and economic instability, fostering an environment for extremist ideologies.
• Rise of Fascism and Nazism: The aggressive, expansionist ideologies of fascist Italy under Mussolini and Nazi Germany under Hitler sought to overturn the post-WWI order and expand their territories.
• Failure of the League of Nations: The League proved ineffective in preventing aggression by member states, such as Japan's invasion of Manchuria and Italy's invasion of Ethiopia, undermining its credibility.
• Appeasement Policy: Britain and France's policy of appeasement, which involved conceding to Hitler's demands (e.g., rearmament, annexation of the Sudetenland), emboldened Germany and failed to deter further aggression.
• Great Depression: The global economic crisis led to widespread unemployment and political instability, contributing to the rise of totalitarian regimes and increasing international tensions as nations pursued protectionist policies.