Because of the vote system of USA. It is dual, that means that there are always two parties that are the best and between them, the winner takes it all...
Flordia had not held a vote about prohibition as of 1855.
The court asserted, because such operations occur entirely in one state. in short, congress has the power to regulate trade but not manufacturing. so it would be, A the supreme court ruled that the american sugar company was a legal monopoly since it existed only in one state.