Lutherans have rarely been "unified," and are probably more unified now than when we needed a church for the Germans, another one for the Swedes, one for the Finns, one for the Danes (maybe two), and at least two for the Norwegians (each Norwegian needs a church that they can say they would never go to).
And we began unifying, hence the "old" ALC, The ALC, the LCA and now the ELCA.We don't have the "unity" thing quite right yet.