The Vietnam War Was About...Stealing Asia's Tin?

Fighting over scarce resources have fueled wars back to the Sumerian city-states squabbling over water-use rights of the Euphrates river. Did the same drive fuel America's entrance into Vietnam to take its tin? Listener Toby asks if there's any truth to the the conspiracy theory that only reason the Vietnam war was waged was for a scarce metal, not to fight the communist threat like most of us has been taught.