Answer: the effect of the domino theory.
Explanation:
A domino effect or chain reaction is the cumulative effect produced when one event sets off a chain of similar events. The term is best known as a mechanical effect and is used as an analogy to a falling row of dominoes.
<span>Disease and pollution: improper sewage disposal, contaminated drinking water triggering epidemics of typhoid fever and cholera; fires; overcrowding; and jobs where the causes of urban living in the late 1800s</span>
"<span>An override needs a three-fourths vote" would be the best option from the list as long as your'e referring to an override of a presidential "veto," since this indeed requires such a fraction. </span>