Frosinone steadily expanded its population in modern times, passing from around 2,000 people in the mid-17th century to the over 10,000 it had at the Unification of Italy (late 19th century). In 1863, it was connected to the national railway network. In 1927, the Fascist government made it the capital of a new province, created with territories from the provinces of Caserta and Rome. In 1943-1944, during the Allied invasion of southern occupied Italy in World War II, it was bombed 56 times by Anglo-American planes; the first Allied troops entered Frosinone on 31 May 1944.