Which of the following statements about slavery is true? It had existed all over the world in various forms for thousands of years.

It existed only in Africa before the sixteenth century.

It began with the Spanish and Portuguese transatlantic slave trade.

It first began in Africa in the 1500s and then spread to others parts of the world.

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