In the state in the Midwest of the USA with Jefferson City as its capital, viticulture was influenced by immigrants from Germany and Switzerland at the beginning of the 19th century. The area around the town of Dutzow, founded by Germans in 1832, is still called Missouri-Rhineland today. After the American Civil War (1861-1865), Missouri replaced the state of Ohio for some time as the most vine-rich country of the then USA. In 1873 the French biologist Jules Émile Planchon (1823-1888) made a study trip in connection with the phylloxera catastrophe and met Charles Valentine Riley (1843-1895), the entomologist responsible for Missouri. As a result, millions of rootstocks were shipped from state nurseries to France and other countries in the fight against phylloxera. These included varieties created by breeder Hermann Jaeger (1844-1895). At the beginning of the 20th century, Missouri was the nation's second largest wine producer and also gained international renown, but its decline was mainly due to the American prohibition (1920-1933).