推荐回答（5个）
因为晋朝分为西晋和东晋，所以称为二晋。
魏咸熙二年十二月丙寅（266年2月8日），司马炎逼迫魏元帝禅让，即位为帝，国号晋，建都洛阳，史称西晋。西晋灭亡后，时任丞相的琅琊王司马睿受到王氏和中朝勋臣的一致拥戴，于公元317年三月在建业承制改元，即晋王位，改建业为建康，史称东晋。
扩展资料
西晋承袭曹魏领土，统一后又占有孙吴疆域。东晋随其疆域的变化而有增减，北界主要在秦岭淮河一线。
两晋的政治体制为世族政治， 是隋唐的三省六部制的基础。 而晋朝时期的农业、商业、手工业等相比较三国时期有了进一步发展。
晋朝虽为汉末以来中国文化中衰时期，但在哲学、文学、艺术、史学、科技等方面也有新的发展。两晋的文化走向多元发展，是一个文化开创、冲突又融合的时代，由于儒教独尊的地位被打破，哲学、文学、艺术、史学及科技纷纷出现革新，有些成为独立的学问。
当代思想有由本土发展的玄学、道教及由印度东传的佛教，士大夫纷纷盛行清谈。由于边疆民族带来草原文化，东晋则拥有中原文化及江南文化，双方逐渐展开文化交流或民族融合。
晋朝开国皇帝司马炎的父亲司马昭被魏帝曹奂封晋公。咸熙元年（264年），加封晋公晋王，这也是晋朝国号的由来。
参考资料来源：百度百科-晋朝
晋朝分为西晋和东晋
西晋(265~316年)公元265年，曹魏大臣司马懿之孙司马炎篡夺皇位，改国号为“晋”。定都洛阳。司马炎就是晋武帝(庙号世祖)，它以其强大的军事力量统一了当时还处于分裂之中的中国，结束了东汉末年以后的混乱局面,。但由于统治阶级的内部矛盾，在很短的时间内，西晋王朝便分崩瓦解，使中国又恢复到原来的分裂状态。这朝代为时仅五十一年，倘由灭吴始计，则仅三十七年。
东晋（316年－420年），是由西晋皇室后裔司马睿在南方建立起来的朝廷，统治范围因为中原陆沉，形成特殊的统治形式。因少数民族内迁，建都洛阳的晋朝（西晋）亡国，琅琊王司马睿在建康（今南京）即位，即晋元帝，史称东晋。与北方的十六国并存，这一历史时期又称东晋十六国。在东北和西北、北方的领土联系不畅，长期以属国的形式间接统治。东晋时代，也曾经内部四分五裂。420年，宋公刘裕废除晋安帝，建立刘宋，进入南北朝时期。
灭三国的是西晋，后期西晋由洛阳迁都建康（今江苏南京）史称东晋
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