The single greatest difference between early American and German psychology was that:

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Early American psychology emphasized practical applications, such as the development of intelligence tests, whereas German psychology focused more on basic and pure research on consciousness. American psychologists also defined psychology as the science of behavior rather than the science of mental life, which was the focus of German psychology. Psychoanalysis did not gain widespread acceptance in American psychology until the early 20th century.

The Single Greatest Difference Between Early American and German Psychology