Alsace
Alsace (Ger. Elsass) is now two French departéments, Bas-Rhin [67] (Lower Rhine) & Haut-Rhin [68] (Upper Rhine). The Territory of Belfort [90] is sometimes also included. The Territory of Belfort was formerly part of Haut-Rhin. From 1789 (French Revolution) to 1871, the Departément of the Territory of Belfort didn't exist, because it was included in the department of Haut-Rhin. After the war in 1870-1871, all of Alsace was annexed by Germany except the region of Belfort, which became the "Territory of Belfort" (departément n° 90) in France. After World War I (1918), Alsace became part of France, but the Territory of Belfort remained a separate departément. So, if you have an ancestor who lived 1789-1871 in Haut-Rhin, check for records in the Territory of Belfort. In general, the Alsace was French 1648-1871, German 1871-1918, French 1918-1940, German 1940-1945, French since 1945. A short timeline-table, called Alsace-Lorraine — an Enclave of Ethnic Germans ...