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.

forty niners migrated west due to gold discovery in california and it the west was a new place for hope this : )

explanation:

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;