This would have resonated very well among Americans in 1912, because back in those days we knew full well who the founders were, it had been in the textbooks. Even a century after Washington's passing, his star was so bright, he was such an incredible role model, that the point of this cartoon is impossible to miss - "Theodore Roosevelt, YOU are no George Washington!"
What the progressives had to do, is clear. Revise history. One of the first places that progressives established as a stronghold was academia, you may know that Woodrow Wilson was the president of Princeton for 6 years. Having complete control over the universities afforded progressives a great opportunity. Someone gets the bright idea about removing The Colored Patriots of the American Revolution from school books, give it a short time for people to forget, then they've given themselves a convenient way to now attack the Founders for being racists. Then they could remove from the textbooks that several of our Founders were dirt poor. Now the progressives can sneer at our Founders for being nothing but a bunch of rich white racist elitists. And finally, it's put into motion to take the Founder's faith out of the textbooks, now the Founders really aren't even the Founders. Rich athiest racists, a bunch of white elitists who now only exist on a bunch of old dusty documents. Why on earth would you consider any of them a role model?
This was done so the progressives could rule over us. Sun Tzu said:
If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle - Sun Tzu (Chapter 3)
You don't know who you are as an American, and you don't know who the progressives are. Both have been removed from the textbooks. You're ripe for the taking.