因为清朝封关，而明朝朱元璋北伐北元13次虽然达到了汉唐时代的最大北疆，但是还持续与蒙古人战争200余年，东北只开发辽宁

来源: 老生常谈12 于 2025-02-24 20:31:17 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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