Answer:
true
Explanation:
If its something someone can look at then it is a visual aid
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Question in unclear..but I would say chemicals/hazards..?
Answer:
See below.
Explanation:
World War I 1914-1918
Isolationism (after World War I) 1920s - 1930s
World War II 1941-1945
participation in the U.N. 1945-present
Containment (after World War II) 1947-1989
Gulf War 1991
