Final answer:
The secret agreement made by Britain and France before the Versailles Conference was the Sykes-Picot Agreement, which aimed to partition areas of the Middle East after World War I. France gained control over Lebanon, Syria, and northern Iraq, while Britain gained control over Jordan, Kuwait, and southern Iraq.
Step-by-step explanation:
Before the Versailles Conference, Britain and France made a secret agreement known as the Sykes-Picot Agreement in 1916. This agreement was made to partition areas of the Middle East after World War I. The agreement divided the areas of the Middle East under two spheres of influence, with France gaining control over what is now Lebanon, Syria, and northern Iraq, and Britain gaining control over Jordan, Kuwait, and southern Iraq. The agreement also supported the creation of an independent Arab state, although this did not happen.