Check out this link of where Massachusetts stands in the country.
http://blogs.edweek.org/edweek/inside-school-research/2017/07/how_accessible_is_gifted_education_in_your_state.html?qs=gifted+education
http://blogs.edweek.org/edweek/inside-school-research/2017/07/how_accessible_is_gifted_education_in_your_state.html?qs=gifted+education