I do not believe that would affect DNS since it is distributed. The root zone file has five servers listed as authoritative for .ly

  LY. NS AUTH02.NS.UU.NET.
  LY. NS PHLOEM.UOREGON.EDU.
  LY. NS DNS.LTTNET.NET.
  LY. NS DNS1.LTTNET.NET.
  LY. NS NS-LY.RIPE.NET.

I'm sure at least the uu.net and uoregon.edu servers are located in the US. Besides, your ISP DNS caches will stay warm for several days.