Answer:
A glacier is a river of ice that moves downwards from high mountains
Answer:
These areas had the most resources.
Explanation:
When you are settled by rivers, you have the sources you need to grow crops, raise life such as cows, pig, chicken. Not only this but you also have a place to bath, collect drinking water, and wash clothing. Life thrives more on river sides rather than inland during these times as they did not have all the tech we do today.
B. Muslims
even the name of the country is "Islamic Republic of Pakistan"
Droughts: Droughts are usually caused by high temperatures and to super dry weather
A biggie: the transcontinental railroad. Because it would economically improve wherever it was, both the North and the South competed for the railroad to be in their respective territory, evidenced by the Kansas-Nebraska Act and the Gadsen Purchase and induction of California as a free state in 1860.
In addition: people could get land cheap because it was abundant and might leave to start afresh economically.
There's other stuff I can't remember as clearly, but there's a little and I hope it helps :)