Final answer:
The main long-term causes of WWII include Economic instability, Treaty of Versailles, Militarism, Nationalism, and Imperialism, while the immediate triggers for the war were the Invasion of Poland, Blitzkrieg tactics by Germany, the Nazi-Soviet Pact, and the attack on Pearl Harbor.
Step-by-step explanation:
The long-term and immediate causes of World War II are rooted in both global and specific historical events leading up to the conflict. Among the long-term causes were Economic instability due to the Great Depression, harsh measures and resentment stemming from the Treaty of Versailles, the rise of Militarism and stockpiling of new weaponry, pervasive Nationalism which created tensions between nations, and Imperialism leading to conflicts over colonies and territories.
The immediate causes that sparked the actual commencement of WWII were the Invasion of Poland by Germany, the use of Blitzkrieg tactics that quickly overwhelmed the Polish defenses, the secretly arranged Nazi-Soviet Pact which emboldened Germany, and finally, the Pearl Harbor attack which brought the United States fully into the war. It is important to note that the Assassination of Archduke Ferdinand was an immediate cause of World War I, not World War II, and events like the Battle of Stalingrad, Hiroshima, and Nagasaki occurred during the war and are not causes of it.
Therefore, the most accurate combination of long-term and immediate causes can be represented as follows: Long-term causes - Economic instability, Treaty of Versailles, Militarism, Nationalism, and Imperialism; Immediate causes - Invasion of Poland, Blitzkrieg, Nazi-Soviet Pact, and Pearl Harbor attack.