Ads back then relied on long body copies to sell. This was also when consumerism started, and purchasing power increased. One of the most popular ads during this time was JM Flagg's I Want You for the US Army to recruit servicemen for the two World Wars.
Ads became more imagery-oriented, and while long body copies were still common, one-liner slogans gained exposure. The We Can Do It! poster was iconing during World War 2.
Ads this time ushered a new approach to ad layouts, many of which are still in use today. Body copies were moved to the bottom, as well as increased usage of imagery. Volkswagen's Think Small was one of the most iconic ads during this era.
As photography evolved, so did ads which used better images and shorter body copies. Coca Cola was an example, as well as then-startup Apple.
The 80s saw ads which looked more minimalistic and less cluttered than before. Advertisers capitalised on increased consumer purchasing power too. There, however, were still copy-heavy ads especially those designed by computer manufacturers.
Minimalism and pop culture carried on through the 90s, and featured some of the most recognisable ads of all time. Meanwhile, automotive manufacturers heavily advertised then-modern car features and still had copy-extensive ads.
Year 2000 saw minimalistic ads, with dominant imagery and often relied on digital post-processing. Personal devices were also heavily advertised, as the new millennium saw new phone and laptop models released to the market.