16) The Fugitive Slave Act
(17) Seven Southern states seceded and formed the Confederate States of America.
18) South Carolina
The answer to this question is D
The main reason why mass media is more effective in forming public opinion today is because of "globalization", which allows media outlets to obtain very reliable information from all across the globe at an unprecedented speed.
it started another red-scare in the U.S., people with common sense do not like communism, so fear of immigrants starting a communist revolution spread