From population to trade, test your knowledge of China's history, politics, economy, and relations with the United States.

Test your knowledge of Iraq, including its oil wealth and the 2003 U.S. invasion.

Test your knowledge of Iran, from its politics to its oil industry.

Test your knowledge of U.S. secretaries of state, from the founding of the country to the present day.

Take this quiz to test your knowledge of the biggest events of 1968, from the Vietnam War to the civil rights movement.