Michael Jackson performs in his "Scream" video for MTV in 1995.
Michael Jackson performs in his "Scream" video for MTV in 1995. Paul Whitsitt/AP
As a major new survey from Pew Research Center examines the generation gap in politics, we take a closer look at what, besides year of birth, differentiates one generation from the next. From the dawn of rock 'n' roll to the emergence of hip-hop, from "We Like Ike" to "Yes We Can," from a man on the moon to an iPhone in the pocket, here are some highlights from each of the four generations covered in the survey. We couldn't mention all of them here, so please share what you think are the defining moments of your own generation in the comments section below.