Problems in Germany do not affect the US servers, period.
Having said that, I seem to recall that over the weekend and during the voice chat meeting (which was hosted on a German TS server), there were storms in the Florida Panhandle. Those storms might have affected connections to the US servers.
As others (specifically Jguy) have mentioned, regional connection issues can also affect latency times from where you[ are and the US servers, mainly through re-routing delays. While small in themselves, the actual times in milliseconds are multiplied, depending on how often the connection gets re-routed.
YMMV.