Which of the following was a reason why the byzantines and sasanians more or less left arabia alone?

How did people in the 14th century understand black death

What are three supporting points as to why opium was wrong in the chinese trade? why should it have stopped? (opium wars)

Mee why did the government control the news and information americans received about the war? to eliminate propaganda that unfairly targeted immigrants to influence public opinion in support of the war effort to inform americans about troop movements and major battles