I do know that Wisconsin allows breastfeeding. I found a list somewhere when I was reading up on it before my daughter was born. I couldn't tell you where though because I checked every book out of the library on it and got some more through interlibrary loan.
Here Is an exhaustive list of the laws made to encourage and protect women who choose to breastfeed their infants.
The Department of Health and Human Services also are given government funding to educate expectant mother of the benefits and methods of breastfeeding. It's actually cheaper for the governmental agencies because they aren't needed to provide formula for these mothers who end up under their umbrella.
Many hospitals are beginning to provide full time on staff lactation consultants as well. When my daughter was born a lactation consultant was at my hospital room door the next morning to assist me and was a great help in getting me started. My insurance also paid for a breastpump because I was having trouble getting my milk to come in (average 2-3 days mine was 7 days).
In my parents generation, it was the common suggestion of Dr's for the women to put the infant on the bottle as soon as possible. They are continuing to find benefits to breastfeeding and there is a countrywide campaign by health departments and professionals to get back to breastfeeding. Many women of my mother's age are unfamiliar with breastfeeding and still think as they were told when they were young mother's that breastfeeding is unnecessary. It will take up to 3 generations to change that thinking.