During the 1920s, the united states experienced unparalleled prosperity and economic growth. identify two reasons for this economic prosperity. highlight 2 reasons in selection under "reasons for the prosperity" heading. then identify two changes that were created by this prosperity. highlight 2 changes in "changes in american life during the 1920s." reasons for the prosperity demand for automobiles increases lack of new innovations in production halt to further european immigration installment buying and buying on credit changes in american life during the 1920s a decline in consumer spending on big-ticket items the increase in buying through catalogs growth of radio and magazine advertising the decline of spending on home consumer devices