1. <span>Germany, Britain, Japan and Russia
2. </span><span>The British because of the Yangtze River.</span>
Answer:
An empire consists of a central state that also controls large amounts of territory and often diverse populations
Empires rise and grow as they expand power and influence, and can fall if they lose control of too much territory or are overthrown
Historians can better understand these processes by comparing how they occurred in different empires
Explanation:
The factors that made it difficult for Eastern Europe to improve its water quality were outdated sewer systems, raw water quality, worn-out water utilities and unskilled employees. So we can say that four options given in the question fits the bill perfectly. These basic infrastructural reasons were responsible for being a hurdle towards improving the water quality. <span />
• A long term rise in the population.
• The emergence of powerful and
independent towns.
Some dangers included:
1) Isolated enemy troops: They can still do damage on supply routes, wreak havoc whenever allied troops landed there, and, if they had a way, travel back home to become reinforcements for the enemies.
2) longer supply routes: As land in between the major islands (that the US have taken) is still teeming with enemies, it would mean that ships and airplanes would not be able to be as safe, or make a landfall to get more freshwater or other supplies on board.
hope this helps
