1 jun 1908 año - Mandatory pasteurization
of milk in the city of Chicago, IL
Descripción:
 "City of Chicago passes ordinance requiring all milk sold in the city to be pasteurized."
Source: 
https://www.ncleg.gov/DocumentSites/Committees/HSCAR/Meetings/2011-2012/4%20-%20March%207/2012-0307%20B.Riley-%20NCGA%20Research%20-%20Fed%20and%20State%20Regs%20of%20Raw%20Milk%20Presentation.pdf 
Añadido al timeline:
fecha:
1 jun 1908 año
Ahora mismo
 ~ 117 years ago