Answer:
making accusations of treason without evidence
Explanation:
McCarthyism (named after US Senator Joseph McCarthy) was the practice of making accusations of treason without having the evidence to support it. This period was known as The Red Scare and lasted from the late 1940's through the 1950s.
The territories were very spead out, making it difficult to rule the empire.
It first started with the Pearl Harbor Attack and was officially announced by Roosevelt in the Quarantine Speech.