Why did Germany abandon the "Sussex Pledge?

As the war progressed, Germany had more and more self-confidence.

Explanation:

Even before 1917, Germany extended its treaty with the United States. At that time, the united states threatened Germany, which withdrew, and German diplomats pointed out that the incident would not happen again. As the war progressed, Germany had more self-confidence. They believed that a total submarine war could defeat their suburbs as the united states became involved in the war.

die.

explanation:

considered the turning point in pacific war. the japanese tried to lure the american navy out so it could be destroyed but failed. the americans were led by admiral chester nimitz. the victory by america would put them on the offensive for the remainder of the war.