Humans, like all other species, have been driven to leave a genetic legacy on this earth. Then we became the only species to develop culture to deal with change. Cultural evolution developed a symbiotic relation with genetic evolution, with humans being the main agents of cultural evolution, but with culture also impacting genetic evolution by favoring certain traits, such as non-aggressiveness.
In modern history, humans have also increasingly been driven by not only leaving a genetic legacy, but also a cultural legacy. While it used to be the purview of the cultural elite — the published writers, famous artists, architects, wealthy art benefactors, and political leaders –, the democratization of culture through the web and cheap technologies that allow anyone to become content/culture creators, has created an environment where everyone can leave a cultural legacy.
Of course, and as many leading thinkers agree, the web is not flat, and new hierarchies that curate real cultural legacies are emerging — we just don’t know who the new cultural kingmakers are.
A good example of cultural vs. genetic legacy is that of Abraham Lincoln. His gene line died off in the early 80’s but his cultural legacy will live on for many more generations.