Early Church Fathers do not comment on nationalism (or on turning nations into Christian political entities with Christianity “twisted in with national constitutions”) in Matthew 28:19.
Eusebius of Caesarea (early 4th century) comes nearest to a political-providential reading. He repeatedly cites the verse (often as “make disciples of all nations in my name”) and argues that the unity and peace of the Roman Empire under one emperor made the worldwide spread of the Gospel possible. He sees the coincidence of imperial unity and the preaching of one God as fulfillment of prophecy.
Even here the point is missiological and providential, not a theory of ethnic or civic nationalism, nor a call to rewrite national constitutions. Eusebius is describing how God used the existing imperial order; he is not outlining a political program derived from Matthew 28:19.
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