Before the USS Maine exploded, the United States was trying to expand as a world power. Thus, many Americans blamed Spain for the explosion of the USS Maine because it gave them a reason to declare war on Spain and take control of Spanish territory in the Pacific and Caribbean.
The right answer for the question that is being asked and shown above is that: "D) trade imbalances caused by Emperor Ashoka's reign in India. " The Han dynasty (206 BCE – 220 CE) was weakened significantly because of the trade imbalances caused by Emperor Ashoka's reign in India.