Hmm. The sinking of a civilian ship. by Germans
I believe the answer is: C: The articles threatened national security
According to the national defense departement, publishing articles regarding Military tactics in vietnam war would potentially endanger the troops in vietnam. We cannot know if vietnam troops have any spies in national soil, so as a precaution, the articles is banned from being published.
Answer:
cast a ballot. basically vote
Explanation:
Own a slave in The US, and buy or sell slaves.
A written calendar with religious observations