True, but it surprises me that Germans would not use the Franco-Prussian War of 1870-71 for reenactments. Battles on the scale of Civil War ones, some bigger. Innovations such as the needle rifle and the chassepot changed warfare. The 1866 Battle of Sadowa saw the Prussian army with breech loaders against an Austrian one with muzzle loaders. All the major powers in Europe fought a major war within a ten year period of the Civil War. It surprises me that they look to our history when there is plenty to reenact in their own, without any political baggage.
In the seceded states and the border states allegiances were divided. In Missouri away from the large German population of St Louis most Germans favored the Union. Disunion was seen as leading to the political fragmentation that had made Germany a perpetual battlefield and the resort of a mass of parasitic petty nobility. On the frontier in Texas the German communities in places like Fredericksburg pretty much seceded from the Confederacy. The US Army was seen as the protector of the settlements from raiding Indians and secession removed this protection. For four years these towns lived like independent city states and formed their own home guard and negotiated with the local Indians to enlist them sin keeping distant raiders away.
In long settled areas such as North Carolina where there were significant German and Swiss-German communities there was pretty universal support of the CSA. In Charleston one of the three or four actually complete militia artillery units ‘The Charleston German Artillery Company’ took part in four years of operations starting with the firing on Ft Sumter and they were considered one of the premier artillery units in the Confederate forces.