The Hearst family and the Duponts made enough stink to make it illegal.
The Hearsts were worried over all the acres of woodland they owned and when it was found that the hemp could be mechanically stripped and would actually make a better as well as cheaper paper! They just kept making it front page news!
About the same time the Duponts had just found how to make Rayon and Nylon and the hemp was again a cheaper solution. The Duponts had a relative that was made the drug czar for the USA and that is how they used their power to have it made illegal.
Now you'd have the drug industry fighting it being made legal as well!
Just goes to show, big government is bad as well as big business!
How much can you afford? Total savings to have it made legal with it being taxed, it would mean less prisons(fight the unions), Less police (fight the unions), Cut the size of the DEA and probably a couple of other branches of the government (fighting more unions).
Total, in about five years time (needed to stop feeding the system and desolve it) would probably average more then five billion savings a year in government spending conservatively!!!
Nice savings! Probably quite conservative!
Then there is the profit from the tax to consider for income! The government might not need to raise taxes for a week or two!!!