The answer is B, usually history is passed through oral ( mouth to mouth ) so it’s not totally accurate but written records shows proof of civilization. Hope this helps!
The second option, i believe
Answer:
chain reaction.
Explanation:
thats what its called, or the domino effect
It was the "Open Door Policy" that was the name of the trading policy that Secretary of State John Hay initiated with China and the European nations that already had a presence there, since the US wanted to benefit from trade with China as well.
