Federal court decisions can create new laws and influence subsequent rulings, though these must be based in federal authority granted by the Constitution. This United States' legal lineage can be traced to English common law through which of the systems of law listed below?

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countires in an effort to build a stronger team. after learning this, the secondteam begins its own recruitment campaign to find better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rivals most recent addition. which idea from the cold war is most similar to this scenario