Reserve currency before the beginning of the worldwide credit crunch related recession and Eurozone crisis, which harmed the euro and slowed its adoption. Since 2009, the reserve currency use of the euro has continued to drop, down to 23.9 percent in 2013. The Dutch guilder was the "de facto" reserve currency in Europe in 17th and 18th centuries. The United Kingdom's pound sterling was the primary reserve currency of much of the world in the 19th century and first half of the 20th century. The emergence of the USA as an economic superpower, and the establishment of the U.S. Federal Reserve System
S. S. Still day for burial at Woodland Cemetery. On October 3, 1877, Summerfield married Ella Daugherty in Lawrence, Kansas. They raised two children: George and Delia. S. S. Still Summerfield Saunders Still (1851–1931) was an osteopath and founder of a school of osteopathy. Still and his wife Ella Daugherty married in 1891 and had two children, Persus (Percy) who became a surgeon, and Christina. Still was the son of James Still, a medical doctor trained in Chicago, Illinois, and Rahab Saunders Still. The Still family moved to Kansas, where S. S. Still was educated in Blue Mound, Eudora, and at Baker University