But carts aren’t useless in the Andes. Trucks and cars travel paved roads in and around the Andes today. The Incans maybe hadn’t found a reason to rely on them

But carts aren’t useless in the Andes. Trucks and cars travel paved roads in and around the Andes today. The Incans maybe hadn’t found a reason to rely on them yet, but this kinda plays in to Diamond’s argument.