What does a rolling burning tire symbolize?

Burning tires produces thick black smoke that can be used as a signal to other protesters, and provides a means of communication that a government can't easily disrupt. An organized protest that can communicate is far more dangerous than a general unruly mob. The Smoke also makes it harder for law enforcement to use helicopters to gather intelligence and monitor the situation. Burning tires makes almost every aspect of suppressing a protest harder.

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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the problem not the