The introduction of interchangeable parts led directly to the what

What does it mean in the declaration of independence for cutting off our trade with all parts of the world

President eisenhowers foreign policy stressed peace, threatened massive retaliation for attacks and what

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.