Why do we need a system for exchanging currencies between nations?

Which member of the president's cabinet is most likely to negotiate a treaty with a foreign country? secretary of the interior secretary of the treasury secretary of defense secretary of state

Open opinion / / / if a juvenile committed murder, should the juvenile be in prison for life or be free and seek instead? which and why?

The bill of rights includes things such as the right to bear arms and freedom of speech. these are examples of which american value?