Wilson believed that since the Treaty of London had been arrived at by secret contract, it was not valid although he had no particular problem with the implementation of other secret wartime agreements, such as the Sykes–Picot Agreement. Overall, Wilson sought to achieve borders that were determined by the populations in the area, rather than by outside parties. Also, the Treaty of London gave Italy areas whose populations were not mostly Italian. Wilson believed that Slavic claims to some of the disputed regions were more sound than Italian claims.