all 50
All US states have laws that relate to littering, disposing of waste material, etc.
It is difficult to provide an exact number as hazing-related deaths are often underreported. However, studies suggest that there are around 1-2 hazing-related deaths per year in the United States.
It is both a social AND a criminal issue. Whether the individual voluntarily chooses to undergo hazing or not is immaterial, many (not all - but many) incidents of hazing cross the line into assaultive type behavior.
In the USA, there used to be laws against miscegenation.
There are many reasons one might participate in fraternity hazing. The most common reason is to fit in. When one participates in a hazing, one participates in stunts that allow them to join the fraternity.
(In the US) MANY states have laws against having opened alcohol containers in the vehicle.
In November 2012, it is easy to find that 39 states and the District of Columbia have laws against texting while driving. It is not so easy to find what those states are.
there is one law against killing cows
Since the act of "hazing" can, and usually does, take many forms (i.e.: physical duress, mental duress, physical assault, etc.) there is no way to codify all possible permutations of an event described as "hazing." However - the specific act used during a hazing process CAN be considered a criminal offense, (e.g.: assault, etc). and it is those, more specific, offenses with which the perpetrator's of the hazing can be charged. Individual offenses may each have its own statute-specified punishment.
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15 out of 34 states were slave states.
Contraceptives were initially perfectly legal. The Comstock Act of 1873 prohibited the delivery of contraceptives, prophylactics, and "marital aids" through the US mail. That was probably the first federal law against contraception, though there may have been some state laws against the practice predating the Comstock Act. Connecticut was one of a handful of states that prohibited contraceptives in the 1960s. In 1965 the US Supreme Court ruled that state laws against contraception were violations of our cherished and beloved bill of rights. So for ALL states contraception was legal by 1965, though many (if not most) states had no laws against contraception prior to that.