Hairstyles of which decade in American history would not have been possible without the bobby pin?

Question

1920s

1940s

1960s

1970s

Answer 1

The hairstyle that would not have been possible without the bobby pin in American history is primarily from the 1940s. During this decade, hairstyles such as victory rolls and updos relied heavily on bobby pins for structure and hold. While bobby pins were also used in the 1920s and 1960s, the innovation and prominent use of bobby pins in the hairstyles of the 1940s were particularly significant due to the influence of wartime fashion and the popularity of pin-up styles.