![]() ![]() ![]() Nonetheless, there are some early examples of what would today be considered civil defense. Since ancient times, cities typically built walls and moats to protect from invasion and commissioned patrols and watches to keep an eye out for danger, but such activities have not traditionally been encompassed by the term "civil defense." The US has a particular lack of early civil defense efforts because it was seldom threatened with a significant attack. There is little known history of civil defense in the United States before the twentieth century. Emergency management and homeland security replaced them. Late in the 20th century, the term and practice of civil defense fell into disuse. United States civil defense refers to the use of civil defense in the history of the United States, which is the organized non-military effort to prepare Americans for military attack and similarly disastrous events. Integrated Public Alert and Warning System. ![]()
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