Even after the First World War , the Rhine Province , and thereby Boppard too , belonged to Prussia . Between 1919 and 1923 , there were efforts throughout the Rhineland to separate from Prussia , but they were unsuccessful . The National Socialists ’ election to power in 1933 brought Boppard no changes at first , as the Centre Party had won 50 % of the vote at the 1933 elections . However , on Kristallnacht ( 9 – 10 November 1938 ) , the Nazis destroyed the synagogue on Binger Gasse ( lane ) , which had been opened in 1867 . Many Jews were seized , and some were sent to concentration camps . Roughly two thirds of the 100 or so Jews living in Boppard emigrated . Those that remained were deported in 1942 . In 1940 , the Marienberg Convent and its associated school were closed under pressure from the régime . Although Boppard was not the main target of any air strike , bombs were nevertheless dropped on the town . Beginning on 19 March 1945 , the Rhine 's left bank was controlled by United States forces , who built an emergency bridge across the Rhine at Boppard
Kristallnacht
Kristallnacht
Boppard