They faced smallpox, low supplies, little to no food, and the bitter cold.<span />
Answer:
Large-scale Mexican-U.S. migration has changed social, economic, and cultural life on both sides of the border. Migration to the United States can offer increased earnings and savings accumulation (Gathmann 2008).
The correct answer is Indus.
The Yellow River was an important part of Chinese civilization.
The Tigris River was an important part of the Mesopotamia civilization, located in modern day Iraq.
The Amazon River is located in South America, and was an important part of several different civilizations.
This shows that the only correct answer can be Indus River.
The second option is the correct answer.
Back in day, there was child labor, so if parents needed more money, they would force there children to work. Thus, they didn't have time for school.