That they could continue to own slaves
The answer is: Cities
Approximately, around 80% of united states population live in the cities. This happen because most of job opportunities that exist in united states (whether it's art, technology, or manufacturing) are located in the cities.
Because of this, even people who born in rural areas start to move to inner cities in order to find jobs and sustain their living.
The answer is B. Germany's invasion of Poland.
~~Hewo~~
The answer to your question is D.
<em><u>Bring about the overthrow of Cuba's communist government.</u></em>
Hope this answers your question!