What does domino theory mean as it applies to vietnam war

Definition of domino theory 1 : a theory that if one nation becomes Communist-controlled the neighboring nations will also become Communist-controlled 2 : the theory that if one act or event is allowed to take place a series of similar acts or events will follow

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was a long, primarily nonviolent series of events to bring full civil rights and equality under the law to all americans. the era has had a lasting impact on united states society, in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism. in the south violence and fraud in southern elections from 1868 to 1876, which had reduced black voter turnout and enabled southern white democrats to regain power in state legislatures across the south