How did speculative investing weaken the stability of the stock market?
a. the flurry of investing artificially raised the price of stocks.
b. conservative investors sold their stock due to the increase in risky investments.
c. when speculative investing increased, the real value of companies decreased.
d. the risky investments caused banks to stop loaning money to investors.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate