By Peter Bergen, Special to CNN
There is a one-word subtext to President Obama's trip to Africa: China.
After 9/11, the United States became embroiled in more than a decade of wars in Asia and the Middle East. As a result, U.S. engagement in Latin America and Africa largely atrophied.
Meanwhile, China saw an opportunity. China has now displaced the United States as the largest trading partners of two key Latin American countries, Brazil and Chile.
China's economic rise is particularly marked in Africa; it quietly surpassed the United States as the continent's largest trading partner four years ago.
Editor's note: Peter Bergen is CNN's national security analyst and a director at the New America Foundation.FULL STORY