Actually, this system was very good at the time. You might not agree when compared to the semi-trailer trucks of today, but it surely beat carrying everything yourself, and they could haul a whole lot more at a time. And haul they did!
They help build everything man had done up to the 20th century (and even still do in many places). They plowed the fields. They dragged the stones for buildings, temples, and pyramids. Moved armies over mountains and then carried them to victory, or aided their retreat as the case might have been.
For thousands of years, they carried the spices of the east to the markets in the west. They helped move families from one nation to another. And without them, America might never have been settled.
After all, they carried the pioneers across the plains from the cities of the east to the gold mines of the west.
