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==Summary==
Spying has had many phases in the United States. It started before the Revolutionary War as an ad hoc network of spies that then evolved into more elaborate agencies in the Civil War. However, that period showed deficiencies by not coordinating activities. By the late 19th century, the Secret Service became the central spy service and later the FBI emerged as the agency that conducted forms of domestic surveillance. During World War II, there was an increased need to develop better foreign espionage. This led to the emergence of the CIA. Modern spying has also increasingly led to closer coordination between foreign and domestic surveillance.
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