Yang jian founded the sui dynasty in 581 ce by overthrowing the zhou dynasty that ruled northern china. in 589 ce, yang jian conquered the areas of southern china and officially brought an end to which of the following periods?
a.
warring states period
b.
spring and autumn period
c.
three kingdoms
d.
period of disunion

Ateam of scientists studied the sediment at the bottom of an ancient lake. they were able to determine the weather conditions of the indus valley in ancient times. they found that the entire area had suffered a drought after the monsoons declined. this drought lasted 200 years. because of the drought, there wasn’t enough food or water. the people of the indus valley were forced to leave their cities.

The largest city in brazil, sao paulo, has a population of about 11 million. based on the rank-size rule, what is the population of the second-largest city, rio de janeiro, most likely to be? a. 8 – 10 million b. 5 – 6 million c. about 3 million d. about 1 million

In the supreme court’s decision in korematsu v. united states, the court said that korematsu