In 1856 the Civita Farnese road was opened, which still today connects Arce with Itri, near to the Tyrrhenian Sea coast. On December 4, 1884, the Roccasecca-Arce railway line was inaugurated, which was subsequently extended to Avezzano. In 1927, with the dismemberment of the former province of Caserta, of which it was part, was included in the province of Frosinone. During late World War II, Arce was occupied by German troops until May 29, 1944, when Allied troops from Cassino arrived.