Ghana joined the WTO on its first day and had been in GATT since 17 October 1957
Background
The World Trade Organization records that Ghana has been a WTO member since 1 January 1995. That is the day the organisation itself came into being, so Ghana is a founder member. Ghana had been a member of the General Agreement on Tariffs and Trade since 17 October 1957. That GATT accession came in the year of Ghanaian independence. Ghana's trade policy, including its cocoa and gold exports, is conducted inside this framework. Membership of the trading system is the backdrop to the regional free trade arrangements Ghana also belongs to.
In plain words
GATT General Agreement on Tariffs and Trade — The 1947 trade agreement that governed world trade rules until the WTO replaced it in 1995.