During the 1920s laws were passed that limited immigration into the United States. What was this called and why do you think these laws are supported by many Americans? (Write 4-6 sentences) PLEASE ANSWER I HAVE TO DO THIS BY TODAY

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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