I only saw the HD image posted by drinchev, and I think it explains this quite well: - Cooper sends back data to Murph so humans on earth can build space colon

I only saw the HD image posted by drinchev, and I think it explains this quite well: - Cooper sends back data to Murph so humans on earth can build space colonies but they aren't much more advanced than that. They basically "just" survived - Humans continue working on the data after the end of the movie, ultimately being able to create tesseract - They create the wormhole next to Uranus and the final tesseract for past Cooper to send data even further in the past