Answer: Germany was stepping up its efforts to stop goods from reaching the Allies.
Explanation:
After the Lusitania incident in 1915, Germany had pledged to stop unrestricted submarine warfare. They made that pledge to keep the USA from entering the war st that time. But by 1917 Germany went on the offense with submarines again, hoping to end the war and win. However, this was one of the factors that pulled the USA into the war, and Germany lost.
Developing nations tend to be more heavily affected by pandemics than developed ones because developing nations lack the resources to control the spread of disease - B. This often is the case and has also been the reason why many deadly viruses have been spread out in Africa for example or some parts of Asia in comparison to the US.
He was the first U.S president to ever establish a relationship with China
The most economic event was the civil war i hope this helps
