A:/kloc-In the second half of the 9th century, an important part of American secondary education reform was to solve the problem of the connection between secondary schools and universities. People began to put forward reform ideas from the educational objectives and the structure of higher education itself.

1892, Harper, president of the University of Chicago, took the lead in proposing the idea of dividing the four academic years of the university into two stages. The idea of this system is to divide the university four years into two stages, each of which is two years. Students are required to finish the first stage and obtain the "primary certificate" before continuing to the next stage of study.

College is a transitional education from secondary education to higher education. Students can find jobs directly after graduation, or transfer to the third year of a four-year university for further study. College meets the rapid increase in the number of people who want to continue their studies in universities, and also provides some students with opportunities to receive certain vocational education to adapt to their lives and employment.

The emergence and development of American junior college movement is the product of the popularization and democratization of American higher education, which meets the needs of American social, political, economic and cultural development, becomes an important part of American higher education and constitutes an important level in the American higher education system. However, there are also some problems in junior colleges, such as the academic standards are not as strict as those in four-year universities or junior colleges, and students lack the growing experience of living away from home.