Find a map of states with right-to-work legislature in 2015 on the Daily Signal website. You can also find a map of right-to-work states with links to each state's specific legislature on the National Right to Work Legal Defense Foundation website.
The term "right-to-work" refers to a worker's ability to decline union membership while working within a state, according to the National Conference of State Legislatures. Unions are allowed to operate within right-to-work states but cannot compel workers to become members as a requirement of their jobs.
Right-to-work state workers have statistically lower salaries than workers in states without right-to-work legislation, according to the Economic Policy Institute.