Regarding Milwaukee research, unfortunately, there are no Balde surname entries or references found in the local resource "Milwaukee's German Newspapers; an index of death notices and related items" -- but the time frame of the ongoing work is limited to 1844-1950. However there is a query in these papers for Karl Balda, from Petwitz a. d. Neisse in 1931.
Indexing Milwaukee's German newspapers continuously since 2007... helping family researchers collect evidence contemporary with their historic German-American families.
gary.rebholz@gmail.com, originator/compiler/editor, Milwaukee Wis.