There was a famous story back in 1997 about a Danish mother that left her toddler outside the restaurant. Some practices for behavior in public, common and accepted outside the US, might be illegal or considered "shocking" in the US. This could be surprising to new immigrants. I am not referring to anything as barbaric as Female Genital Mutilation, but things like leaving your child home alone when he/she is in grade school and the like.
Are there other "benign" practices, that are acceptable in much of the world, that might be considered illegal or out of the norm in the US? Or are there any guides that one might refer to for this kind of information?