All 4 contributed, but B and D are the most direct causes.
Answer:
B: Federal judges have no term limit
Explanation:
You must be at least 65 years of age to qualify to be a federal judge which makes A false, and federal judges serve for life which makes C false.
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I believe the answer is:
An oven that used air drafts for heating
Hope this answer has helped
The war giving Cuba independence from Spain was the "Spanish American War", since this was the war in which the US engaged with Spain in part because of their ill treatment towards the Cuban natives.