A.
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Answer:
D, oil was discovered on the Arabian peninsula.
Illegal immigration is a problem of the entire federation, not just of the state where the immigrant has entered. That is because the taxes are collected on a federal level and budged distribution is done on a federal level. That means that if a state allows illegal immigration, which usually comprises of people in the gray zone economy, it will harm the people from other states because the immigrants would not be paying taxes and the other states would be receiving less.
