When navies and foreign ministries worked best together

When did the navy and foreign ministry work best together in the United States and Britain?

The suggested periods are the American 1950s and 1960s, and the British 1920s and 1930s, with the 1890s also mentioned.

The suggested American period is the 1950s and 1960s. For Britain, the proposed periods are the 1920s and 1930s, with the 1890s as another candidate. British coordination is judged to have deteriorated in the early 1900s. These are tentative period choices, without detailed historical examples in the brief reply.