Michigan passed a law to ban battery cage confinement in 2009.
Ohio, the nation's second-largest egg-producing state, placed a moratorium on the construction of new cage egg-production facilities.
Legislation to ban the cages will be introduced in Massachusetts soon, according to Farm Sanctuary.
Internationally, progress is being made, too -- in 1992, Switzerland became the first country to ban battery cages, followed by a 1999 European Union directory for all countries to ban them after a 12-year phase-out process.
As animal advocates push for tighter regulations and more regional and federal battery cage bans, consumers can choose not to support the practice by buying cage-free eggs, and by learning more about humane hen production and the meaning of cage-free here.