According to my research on different research methods, I can say that based on the information provided within the question this is an example of naturalistic observational research. This is defined as a research method where the researcher observes and studies a subject in it's natural environment without any interference. That way the behaviors and actions of the subject are as natural as possible, and in term so are the results of the observation.
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The 1920s is the decade when America's economy grew 42%. Mass production spread new consumer goods into every household. The modern auto and airline industries were born. The U.S. victory in World War I gave the country its first experience of being a global power.
