American retro, Chinese retro, European retro, Japanese retro

Quick answer：

Retro styles refer to design trends that harken back to a past era, incorporating elements from different historical periods. American retro styles often feature 1950s and 1960s motifs, Chinese retro styles may blend traditional Chinese designs with modern elements, European retro styles often reflect periods like the Victorian or Art Deco, and Japanese retro styles can include influences from the Edo or Meiji periods. Each style has its unique characteristics and applications in interior design, fashion, and other areas.