Korea divided at 38th parallel” “hungarian revolution crushed” “missile sites spotted in cuba” the events in these headlines contributed to the:

Korea Divided at 38th Parallel” “Hungarian Revolution Crushed”

“Missile Sites Spotted in Cuba”

The events in these headlines contributed to the COLD WAR.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.