Nations are best defined as: Products of the Treaty of Versailles in 1648 Political units that always have sovereignty over a geographic area Groups connected by a unique mix of shared ethnicity, language, religion, culture, history, and/or sense of civic community The same now as they were under medieval feudalism

Groups connected by a unique mix of shared ethnicity, language, religion, culture, history, and/or sense of civic community

Explanation:

Nation is the term used to describe a group of people who reside in the same geographic region, share the same ethnicity and are connected by the same language, customs and history. In addition, members of a nation share a strong sense of belonging and community, allowing everyone to behave relatively homogeneously. In other words, we can say that a nation is made up of groups connected by a unique mix of ethnicity, language, religion, culture, history and / or shared sense of civic community.

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the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.