What is NATO?

A. A pact among nations that oppose nuclear weapons

B. A group of countries that want to trade with each other

C. A subcommittee that is part of the United Nations

D. A defensive military alliance of Western nations

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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