President carter failed to sympathise for the people of his country. Some say that he was greedy and only did what he did to gain popularity. His decisions werent well thought out as well
"De facto" means "in fact, factually" - that something is, indeed, taking place. It is customarily used to denote a situation which is not dictated by law ("de jure") but which happens anyway - so the best answer is A. Law - this segregation is not required by law, but it takes place anyway, for example for financial reasons.
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