Answer: "itinerant teaching" has solved the problem of rural children's reading to a certain extent, but problems such as transportation, remuneration and hardship often affect teachers' enthusiasm, thus prompting the area where the teaching point is located to adopt the practice of running schools independently, which is the bud of "district system". 1766, the Connecticut colony first realized the necessity of dividing the town into several school districts. 1789, Massachusetts issued a decree stipulating four school districts and giving them the right to run schools, from which district system was established.

Because district system adapted to the reality that the countryside was vast and sparsely populated at that time, it was also convenient for local people to directly participate in the management of education, which solved the problem of children going to school nearby, so the states successively established district system. By the middle of19th century, the regional system was widely adopted in the United States. But it also strengthens the localism of education, because the inequality of educational funds between schools hinders the further development of education. Therefore, since the middle of19th century, the states have implemented reforms. After 1990s, the merger and development of school districts has become the general trend.