Answer:Sinking of American merchant ships
Explanation:In early 1917 Berlin forced the issue. Its declared decision on 31 January 1917 to target neutral shipping in a designated war-zone became the immediate cause of the entry of the United States into the war.
Answer:
Import and export tarrifs.
Explanation:
Speculation<span> involves trading a financial instrument involving high risk, in expectation of significant returns.
SO i beleive its
the 2nd one</span>
The treaty prevented the war because <span>The treaty moved the Line of Demarcation 800 miles further west. This gave Portugal more opportunity to claim lands unexplored by other Europeans.
While the portugals were exploring those land, the spain could obtain the resource from the conflicted territories without having to face the threat of the Portuguese's army.</span>