美国陆军历经在美国独立战争中的创建、在美国内战中的初步发展、在两次世界大战中的大力扩编、第二次世界大战后的调整变化和在高技术战争条件下的编制调整共五个时期的发展变化，从一支名不见经传的民兵性质的武装发展成为当今世界一流的正规陆军。笔者试图按照这一历史发展 The initial development of the U.S. Army in the American Revolutionary War, the expansion in the U.S. civil war, the expansion in the two world wars, the adjustment and change after the Second World War and the preparation and adjustment in the high-tech war The development and changes during these three periods have evolved from being an unknown armed militia and becoming the first-class and regular army in the world today. I tried to follow this historical development