Alsace is frequently mentioned in conjunction with Lorraine , because the possession of these two rÃ gions ( as Alsace-Lorraine ) has been often contested in 19th and 20th century history . Alsace is frequently mentioned in conjunction with Lorraine , because German possession of parts of these two rÃ gions ( as the imperial province Alsace-Lorraine , 1871 â `` 1918 ) was contested in the 19th and 20th centuries , during which Alsace changed hands four times between France and Germany in 75 years .