There were a number of reasons for the annexation, military, politically and nationalistic.
The Military felt that it would be a more defensible border and also politcially would be on a federal territory and not one of the member states of the Empire.
Then there's the nationalistic reasons for instance the Alsations and that part of Lorraine did speak German dialects. Moreover since the end of the Middle Ages it had been France, which had expanded at the expense of German speaking territories and the (Holy Roman) Empire (of the German Nation).
The latter is a reason, why French grievances about this loss seem a bit hypocritical; if it's okay to expand at the expense of others, then losing territories is the other side of the same coin.
It's also true, that French and German nationalism isn't completely the same. The former is more civic and the latter more ethnic, though in both cases language plays a large role.
Also according to the treaty of Frankfurt (1871) citizens of Alsace-Lorraine had about a year to choose between staying a French citizen and move or remain in Alsace-Lorraine and become a German citizen.
The Military felt that it would be a more defensible border and also politcially would be on a federal territory and not one of the member states of the Empire.
Then there's the nationalistic reasons for instance the Alsations and that part of Lorraine did speak German dialects. Moreover since the end of the Middle Ages it had been France, which had expanded at the expense of German speaking territories and the (Holy Roman) Empire (of the German Nation).
The latter is a reason, why French grievances about this loss seem a bit hypocritical; if it's okay to expand at the expense of others, then losing territories is the other side of the same coin.
It's also true, that French and German nationalism isn't completely the same. The former is more civic and the latter more ethnic, though in both cases language plays a large role.
Also according to the treaty of Frankfurt (1871) citizens of Alsace-Lorraine had about a year to choose between staying a French citizen and move or remain in Alsace-Lorraine and become a German citizen.
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