Final answer:
Senator Joseph McCarthy's McCarthyism tactics had significant and lasting effects on America, instilling fear and paranoia in society and leading to the blacklisting of individuals in various industries. However, his power waned after making baseless accusations against the U.S. Army and being condemned by the Senate, leaving a lasting impact on American society.
Step-by-step explanation:
Senator Joseph McCarthy had significant and long-lasting effects on America during the early 1950s. His McCarthyism tactics, characterized by making unsupported accusations of Communist activities and disloyalty, instilled fear and paranoia throughout the nation. McCarthy's influence led to the blacklisting and ruining of many careers in Hollywood, academia, and government. However, his power quickly diminished after he made baseless accusations against the U.S. Army and was condemned by the Senate. McCarthy's era of intimidation and the fear it generated left a lasting impact on American society, blurring the line between dissent and disloyalty.