One way in which the Reformation affected kings was that "<span>a. Kings throughout Europe lost power after the Reformation," since many kings were closely aligned with the Catholic Church, which lost a great deal of power as well. </span>
Propaganda, they inspired more people to join the fight on America's side.
Answer:
1. United States ships were getting sunk by German U-Boat warfare
2. Inability to remain neutral
3. Zimmerman Telegram of 1917
4. U.S. economic and political ties to Great Britain