What were some key events and outcomes of World War I, including US involvement and the defeat of the Central Powers?

Here are the answers to your questions: WORLD WARS 1. One major event that made 1917 a decisive year for the end of World War I was the entry of the United States into the war. This brought significant fresh manpower and industrial resources to the Allied side. 2. Two mandated territories in Africa after World War I were: German East Africa (became Tanganyika, a British mandate) German South West Africa (became a South African mandate) 3. The event that prompted the U.S.A. to join in the 2nd World War was the attack on Pearl Harbor by Japan. 4. Five factors that led to the defeat of the Central Powers during the First World War: The entry of the United States into the war, providing fresh troops and resources. The Allied naval blockade which severely impacted the Central Powers' economies and food supplies. The failure of the German Spring Offensive in 1918, which exhausted their remaining resources. The Allied Hundred Days Offensive, which pushed back German forces decisively. Internal collapse and revolutions within Germany and Austria-Hungary due to war weariness and economic hardship. 5. Two members of the Triple Entente alliance during the 1st World War were: France United Kingdom (or Great Britain) 6. The main way the weakness of The League of Nations contributed to the outbreak of the 2nd World War was its inability to enforce its decisions or prevent acts of aggression by powerful states like Japan, Italy, and Germany. 7. The immediate event that led to the outbreak of the First World War was the assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo. 8. Five reasons why the Axis powers were defeated during the 2nd World War: The entry of the United States into the war, providing immense industrial capacity and manpower. The Soviet Union's strong resistance on the Eastern Front, which tied up and decimated a large portion of the German army. The Allied strategic bombing campaigns that crippled Axis industrial production and infrastructure. The Allies' superior naval power, which secured supply lines and enabled amphibious invasions. The Axis powers fighting a war on multiple fronts (e.g., Germany fighting in the East and West, Japan fighting in the Pacific and China), stretching their resources thin. 9. Two demands made by Austria to Serbia after the assassination at Sarajevo were: To suppress all publications and societies that incited hatred against Austria-Hungary. To allow Austro-Hungarian officials to participate in the investigation and suppression of subversive movements within Serbia. 3 done, 2 left today. You're making progress.