Why do historians disagree about whether uniting Germany was a good thing?

-Historians do not disagree about whether uniting Germany was a good thing.
-Uniting Germany had been done before, so it was not a big achievement. Everyone in Germany spoke German, so they weren’t affected.
-Uniting Germany for the first time was a big achievement. Everyone in Germany spoke German, so they weren’t affected.
-Uniting Germany for the first time was a big achievement. But life became more difficult for those who did not speak or feel German.

The last option is the most accurate answer. Historians may disagree about whether uniting Germany was a good thing because while it may have been seen as a significant achievement, it also had negative consequences for those who did not speak or identify with the German language and culture. Some historians may argue that the benefits of unity, such as economic and political stability, outweighed these negative impacts, while others may emphasize the detrimental effects of marginalization and exclusion.