推荐回答（2个）
古代不是谁先进谁强大，因为最先进的武器是骑兵，而中国的优质战马产区是北方草原，马是一种适合生活在寒冷地方的动物，只有在开阔地带奔跑的马才适合当战马，窝棚里的马不适合。结果游牧民族掌握最先进的武器，而拥有产马区的汉人王朝还可以，如汉朝，没有产马区偏安南方就很弱，如宋朝，北边骑马的南边骑大象的偏安南方死路一条。
后勤补给方面，农耕民族占据富饶地带！游牧民族打过来补给很轻松，而农耕民族打过去补给就困难！往往无法长期统治根除危机，一般就算打胜了也会撤军！运输能力不行，最终会选择修城池的方式抵御，这个成本高但是相对于进攻成本低很多，蛮荒地带补给难不好控制！最终长城诞生了！而到了现代出现更先进的运输工具后这些问题全解决了，打仗成了拼后勤，结果生产力发达更具优势，游牧民族再也没有优势被彻底压倒！不得不定居下来搞生产，曾经强大的游牧民族现在全成了弱民！而古代汉人就算想长期控制也不可能，因为那环境下要想生存必须学习游牧民族，结果自己反而成了新的游牧民族威胁汉人王朝，最典型的是辽国，虽说是契丹人统治，但是全国多数人是汉人！从事两种生活方式。
而能不能避免战争？根本不可能！要想避免战争就得成为利益共同体！古代的丝绸，茶叶，瓷器是好东西全部产自长城以南！而游牧民族区的战马是战略物资不会出口，别的东西呢，肉，奶，药材，矿产！放到现代都是好东西，草原上遍地都是宝！放在古代那就悲剧，没有发达保鲜运输技术食物基本无法长期保存进行贸易，不知道矿产资源的用处，也就药材和动物皮毛能进行贸易，但是这样的贸易逆差极大不可能长期维持，最终结果就是战争！而如果大家统一成一个国家这些问题不就解决了？不可能，如隋朝，控制南方发达地区后国家重心南移都向发达地区跑！北方被冷落各方面空虚，结果北方六镇叛乱！这种环境下汉族王朝对北方土地基本没兴趣，只要别来打就行，又无法形成利益共同体！结果无休止的战争！尤其赶上自然灾害不得不打仗，很多民族直接拼光！
北方游牧民族是苦寒之地，自古以来长城以北降雨稀少，不适合耕种，所以游牧民族只能以放牧为生，所以到了冬季缺衣少食，难免要往富裕的南方侵犯，但是总所周知，在古代科技不发达的情况下，最有战斗力的就是骑兵，骑兵最擅长凿穿步兵方针，而且孙子兵法上面明确写明了，骑兵对步兵，可以以一敌三。
当然，我们也有原因，宋朝以后，尚武精神缺失，文学盛行天下，毕竟书中自有黄金屋嘛！而且宋朝由于重文轻武，官员庞大，待遇丰厚，造成了沉重的经济负担，百姓积贫积弱，所以在这种情况下，也造成底层不满，方腊，梁山，这都是真实写照，内忧外患之下，怎么可能不被打败？
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