Answer:
How did shipping routes aid in transmitting the plague? [Answer: Infected rats and fleas made way onto ships in contaminated food and supplies. The plague was also transmitted through rat, work animal, and human waste. Ships could efficiently get to other continents as they sailed the seas.]
Explanation:
Hope this helps
Here's a sentence: The United States has to care about national security but also keep it's treaty with other countries.
They wanted to keep trade with china open. :)