A collapse of their newly independent nations. Although the diverse ethnicities were unhappy under the Austro-Hungary empire, they were secure under the government.
Traveling across the Pacific Ocean would be the longest distance to travel, since it is the largest ocean by square milage, although it would be possible to combine different routes to increase the distance traveled elsewhere.
Answer:
Many of the groups that attacked and invaded the Roman Empire were Germanic tribes from Northern Europe.
Hope this helps
--Jay
I believe the answer is D. The way the workers were treated by big business and big industry.