This kind of federal regulation had not happened before March 1929. Wall Street was afraid that if this happened, people
would not be able to borrow money to buy stocks, and then no
one could buy the RCA stock that speculators were trying to
sell quickly. This led to the Crash because it made stock brokers
nervous that the government was going to clamp down on
speculation, and they were more ready than ever before to
launch a massive sell-off of stocks if that happened.

What is the main idea of this excerpt

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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

Leading up to the french and indian war, the british were