Former Ghanaian Ambassador to the United States Koby Koomson has worked to enhance trade and investment between the United States and African countries. During his term as ambassador from 1997 to 2001, U.S. investments in Ghana climbed from $67 million to more than $500 million. Koomson assisted in the passage of the African Growth and Opportunity Act signed into U.S. law by President Clinton in 2000. He arranged a visit by Clinton to Ghana in March 1998 – the first time a sitting U.S. president visited the country. The next year, Koomson planned the first state visit to America by a Ghanaian president.