Why is the Huang He (Yellow) River Valley known as the "cradle of civilization in China?

Which product would have been most likely to have been traded in this area at this time?

What was unification difficult to accomplish in both germany and italy? a.) weaker states we’re attacked by stronger states for control of the emerging nations. b.) major european powers fought to keep independent states under their control. c.) germans and italians did not share common histories and languages.

Which statement best explains the privileges and immunities clause of article iv of the constitution?