In 1948, Congress carried out the first major overhaul of the Judicial Code since it was originally compiled in 1911. The 1948 code made a few substantive changes in the law, some of which expanded federal court jurisdiction. For example, provisions regarding diversity jurisdiction were altered to include citizens of U.S. territories and the District of Columbia in addition to citizens of the states. Some important administrative changes were made as well, such as establishing the office of chief judge in the district courts and the courts of appeals. Much of the revision involved simplifying and reorganizing the body of statutes affecting the organization and administration of the federal courts. Lastly, many of the changes Congress incorporated were aimed at modernizing and simplifying statutory language. District attorneys, for example, were reclassified as United States attorneys; the Conference of Senior Circuit Judges was renamed the Judicial Conference of the United States; and the U.S. circuit courts of appeals were designated as the U.S. courts of appeals, among many other such alterations.