When the government changes from a democracy to a dictatorship or if the government turns on it's own people. But lets be honest rebellions won't happen since the government controls all of our military power...
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I think it is the last one on the list
Hydrogen atoms combine to make a Helium atoms
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A constitutional convention is a gathering for the purpose of writing a new constitution or revising an existing constitution. Members of a constitutional convention (sometimes referred to as "delegates" to a constitutional convention) are often, though not necessarily or entirely, elected by popular vote.
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