Putting two mules of the opposite sex together just cannot breed. People have tried awful hard but just can't do it. You get the same results if you put two mules of the same sex together.
The inventor of the mule was by a man who got together with other men that dressed up like women. The mule eats less than a horse and carrys a heavier load and is still used today.
George Washington was a financier of the arabian horse thats the mother of the mule.
The arabian horse was put on earth by god - The mule was put on earth by devine intervention of the father of your Country.