How did the roosevelt corollary change u. s foreign policy?

What river systems the worlds earliest known civilization develop ?

What kind of organizations are supported by economic interest groups? a. civil rights organizations b. professional organizations c. womens' rights organizations d. business and trade organizations

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.