What was the PRI and what was It’s impact on Mexico?

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.

How do you know ? what does verne have his characters say and/or that reveal that attitude ?

Which of the following statements is true about the treaty of versailles ?