The index is a must-have tool for anyone researching their German ancestry, as it holds details on roughly 1.5 million people who came to the United States between the years 1875 and 1888. A unique aspect of this series is its broad scope; it doesn't just include individuals from German states or territories but also those from neighboring countries like France, Switzerland, and Luxembourg.
Moreover, the index is especially relevant for those interested in the peak years of German immigration to the United States, which occurred between 1880 and 1885. During this five-year window, a staggering 797,900 Germans arrived in America. So, if your ancestors were part of this wave, the index could be a very useful resource for your research.