Question : Which ideology posed a significant challenge to US dominance in the early 21st century?
Option 1: Communism
Option 2: Capitalism
Option 3: Islamism
Option 4: Socialism
Correct Answer: Islamism
Solution : slamism, or political Islam, posed a significant challenge to US dominance in the early 21st century, particularly in the context of the War on Terror and the rise of extremist groups.