India, Nov. 23 -- What would be the attributes of a foreign policy and of diplomacy to sustain a five-trillion dollar economy? The answer will surely lie in looking back as also in gazing beyond the horizon.

As 2019 ends, it is useful to recall that a century ago, India signed the Treaty of Versailles and joined the League of Nations as a full-fledged member, even while it was still a colony. Next year will, in fact, be a double anniversary. In 1920, India attended the first meeting of the League, and, in 1945, it signed the charter of its successor, the newly formed United Nations Organisation. Therefore, 2020 will mark both a century of Indian multilateralism and 75 years of membership of the UN.

Along with this multilateral heritage is...