From 1776 to 1783, the United States experienced seven years of war of independence. The war caused financial difficulties and political turmoil, and education once declined. After independence, the American government has always attached importance to education as a necessary cause for people to "pursue happiness". Jefferson, the third president of the United States, said in his speech: If a nation wants to be ignorant and free in a civilized country, what it expects must be a situation that has never appeared in the past and will never appear in the future.