Fifteen <a href="https://en.wikipedia.org/wiki/West_Africa" id="mw0w" rel="mw:WikiLink" title="West Africa">West African</a> countries sign the <a href="https://en.wikipedia.org/wiki/Treaty_of_Lagos" id="mw1A" rel="mw:WikiLink" title="Treaty of Lagos">Treaty of Lagos</a>, creating the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Economic_Community_of_West_African_States" id="mw1Q" rel="mw:WikiLink" title="Economic Community of West African States">Economic Community of West African States</a>.