What are examples of spark-Containment system?

What even precipitated Americas entry into World War 2? In the Battle of Fair Oaks Seven Pines neither side won a victory? Is there a World War 1 soldier from Heidelberg named Baumgartner? Who has the best army in Asia? How many columns form the outside of the memorial? Which side in the civil war was the number one killer? The number of Blacks elected to office in the former Confederate states during Reconstruction generally depended on? Did any of the protagonists show signs of excessive ambition for power wealth or territory in the Vietnam war? How was the postwar government of Great Britain different from that of East Germany? What was the daily life of the samurai? What did the National Mobilization Committee do to end the war on April 15 and October 21 1967? How was communisn defeated? What does a zoot suit look like? What did chivalry require of knights that Bushido did not require of samurai? What weaponswere primarily used in this battle of Britain? What was the first military secret weapon was developed under the leadership .? Dissent in a sentence? Where did the prisoners sleep during the Holocaust? Which if any of the founding fathers said that the Second Amendment should apply only to the militia and not the general populace? What happened after congress and the states printed hundreds of millions of dollars worth of paper money to pay for the war?

What are examples of spark-Containment system?