Now I just learnt that Koblenz has a partner city in Texas and it's Austin.
And there is a whole community around visiting each other's city:
Now we have to see if we do another conference in Koblenz and get someone from Austin to come. As far as I know 4 employers of Xojo Inc. near in or near Austin.
PS: Also discovered years ago on a trip to Atlanta that Marietta, Georgia had a German partner city nearby my home town: Linz. So in both cities I saw signs about that partnership.