LOL @ KC
That's the only rebuttal that matters. Pulling up an obscure law from 200+ years ago to rationalize the unconstitutional nature of Obamacare is really grasping for straws. Obamacare is unconstitutional precisely because it applies to everybody. The law you described only applied to shipowners (with respect to penalties) and sailors. By posting this practically ancient law to support your argument, you unintentionally demonstrated how weak your argument is.
Oh please, a mandate to buy insurance is a mandate to buy insurance. If it's applicable to some and not unconstitutional then it can be applicable to all under the same reasoning.
Under your definition a government or state could ban all firearms because it's not unconstitutional if it only effects certain people right?