Scholars believe Indus cities may have fallen into decline when An ecological disaster such as a volcanic eruption occurred

Many people migrated north out of the region

Which of these was one of the most important aspects of washington's presidency a. he did not consider how his actions would affect later presidents b. he came to believe that political parties would be good for the country. c. he insisted that congress make specific rules about the duties of the president d. he did not take advantage of the opportunity to keep the power the country offered him.