Among the key ingredients that propelled the American economy to emerge as the leading industrial power by the beginning of World War I were

A) technological talent.
B) the world's first universal public education system.
C) a large agricultural surplus.
D) entrepreneurial abilities of great industrialists.
E) all of the choices are true.

According to psychological scientists, "dissociative amnesia":

A) is the mechanism that causes traumatized children to repress their ordeal and develop several identities.
B) lacks historical and empirical support.
C) can be uncovered by continuous interviewing
D) occurs when a person keeps recalling traumatic experiences.