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东汉末年,天下大乱,群雄割据,国家分裂。曹操凭着“挟天子以令诸侯”的政治优势和“修耕植以蓄军资”的经济实力,南征北伐,逐个消灭各地割据势力,统一了中国北方。他在统一北方的战争过程中,出于运粮、运兵的需要,先后修建了六条运河。这些运河虽然里程都不长,但由于它沟通了一些自然河流,在交通运输方面起到了重要作用,特别是对现今河北省地区海河水系的变迁和形成,历
The Eastern Han Dynasty, the world disorder, separatist, state split. With the political advantage of “relying on the emperor to make the princes” and the economic strength of “cultivating and repairing military funds,” Cao Cao marched out the Northern Expedition and eliminated the separatist forces one after another and unified the northern part of China. During the course of reunifying the northern part of the country, he built six canals successively for the needs of transporting grain and transporting troops. Although the mileage of these canals is not long, it has played an important role in transportation because of its communication with some natural rivers, especially the changes and formation of the current Haihe River system in Hebei Province.