The weapon that helped continue the stalemate on battlefields during World War I is option<em> D. Machine Gun</em>. A stalemate is a situation in which neither side has a clear victory over the other. The war becomes very long and slow, and armies have to be creative to surprise the enemy. There were many stalemates in WWI, especially in the Western Front.
This plan is known as the Open Door Policy.
This idea was introduced by Secretary of State John Hays in 1899. The goal of this plan was to ensure that all nations had the ability to trade with China. Even though this plan referred to the ability of all nations to trade with China, the real reason behind its development was the fear of the US government being blocked out of trading with China by European countries.
Solid evidence, to be proven guilty
