Part of the reason for the stock market crash was? :
a the high rate of deflation in the 1920s.
b the tax policies of the 1920s, which especially hurt the wealthy who might otherwise have brought more stocks.
c the buying of great amounts of stock "on margin."
d the low tariff, which allowed imports to corner several important american markets.

What do historians call the political, social, or cultural circumstances surrounding an event?

The idea of liberalism in eighteenth-century british politics: a. had mainly a civic and social quality. b. prompted two eighteenth-century leaders, joseph mccarthy and hugh mccarran, to demand independence for ireland. c. brought great wealth and power to its main voice, john locke. d. was compatible with inequalities in wealth and well-being. e. had the same meaning as liberalism in twenty-first-century american politics.

Why are primary sources important when studying historical events