Which of the following was a reason for entrance of the united states into world war i? a. the united states got pulled into the war through its alliance with france. b. the united states wanted to ensure a new nation for the polish people. c. the german use of unrestricted tank warfare d. the german use of unrestricted submarine warfare

The answer is D hope this helps and plz makeest

The correct answer is D. The German use of unrestricted submarine warfare

Basically, Germans started attacking any ship that was sailing in the sea, regardless of who it belonged to or if it was military or civilian. They declared that they would attack anyone who used the sea so they started attacking American ships too. This resulted in the United States entering the war and fighting Germany on land.