Which indo-european tribe developed a strong warrior society and built an empire that was frequently invaded by those seeking fertile land?

Assyrians is the correct answer.

Explanation:

Assyrians were an ethnic group from Mesopotamia, a region in the Middle East. The history of Assyrian people begun with the foundation of Assur; some scholar point out that it happened around the 25th century BC. Even though they were a very powerful tribe at a certain point, it is also correct that they suffered from frequent invasions due to their lands.

c. wright mills's sociological imagination suggest investigating to explain this increase?

answer; southeast asians in the u.s.'