Hampton Roads
Beginning in 1917, as the United States became involved in World War I under President Woodrow Wilson, formerly rural Sewell's Point became the site of what grew to become the largest Naval Base in the world which was established by the United States Navy and is now known as the Naval Station Norfolk.
Lisbon Naval Base
Until after World War I, in reality there was not a single naval base, but a series of smaller bases located at various points of both banks of the Tagus. Among others, in the early 20th century, there was the Lisbon Navy Arsenal, the Doca de Belém submarine base, the Bom Sucesso seaplane base, the Vila Franca de Xira destroyer base, the Vale do Zebro torpedo boat base, the Alcântara Naval Barracks and the Doca da Marinha naval quay.