What if porn on the internet of any variety was illegal; perhaps because around some time in the early years of a public internet, perhaps just as the internet was going from a defense and research institution to being a public one, or as late as the AOL dominated years, that Congress decided because so many communities and states had differing laws on who could watch and what type of porn was watchable. Congress cites their obvious interstate commerce powers as their right to regulate porn over the internet.
Supreme Court upholds the ban, as Lawrence v Texas and other similar court cases that declared any sexual activity to be a 14th amendment right to privacy issue wasn't until 2008 (even today Alabama bans vibrators without a doctor's note; so the idea of banning porn from the internet is not that far-fetched, especially if you're talking late 1980s to late 1990s).
Let's assume any Supreme Court action in the United States doesn't happen until 2008 or later. How does no porn on the internet affect the US history from the creation of the internet until whatever time you think SCOTUS would actually reverse the ban?