The document discusses the history and growth of charter schools in the United States from 1991 to present day. It notes that the first charter school opened in Minnesota in 1991 with 1,100 charter schools and 250,000 students enrolled by 1998. By 2004 there were 3,000 charter schools across 37 states enrolling 750,000 students and currently there are over 5,741 charter schools operating in 41 states and Washington D.C. The document also outlines some of the key characteristics of charter schools.