How did the population distribution of the United States change in the late 1800s and early 1900s? 

employment opportunities, proximity to water and ports, and immigration.

Explanation:

b.

explanation:

he is racist

"oh, lets coppy china and build a great wall around bla bla bla.that way,we wont lose out to other countries." in the end, he did not build anything

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)