 Complete the following phrase:  As the 1920s marked the apex of J. C. Leyendeckers career, so the 1930s marked the beginning of its decline. Around 193031, Cluett, Peabody,  Co. ceased using Leyendeckers illustrations in its advertisements for shirts and ties as the collar industry seriously declined after 1921. During this time, the always shy Leyendecker became more and more reclusive, rarely speaking with people outside of his sister Mary Augusta and Charles Frank had died in 1924 as a result of an addiction-riddled lifestyle. Perhaps in reaction to his pervasive popularity in the previous decade, or as a result of the new economic reality following the 