People also need to learn and realize that comic strips, be it this one or any other, always takes Jabs, and make mockery or exaggeration of real life events. If none of you can see this, then you need to step away from this and work on differentiating from fiction and reality.
Not really true. Many of the Founding Fathers were very much opposed to slave ownership, Adams and Franklin to name two of the more prominent. That was a smoldering powder keg from the start of the Great Experiment and finally went off during Lincoln's presidency. And even though women and native Indians were not allowed to vote, the men didn't necessarily have to be land owners.
But those statements are enough for Dogbert to yank Dilbert's chain and that's what is most important here.