The Germans sank a British ship which had American passengers. This was the first step. After this due to the unrestricted submarine warfare more US ships were sunk by German U-boats.
The Letter
Dear Mother,
Staff Sargent has informed me I will depart at 8:00 A.M tomorrow. Unfortunately, I don't know if I will be making it home anytime soon. Although, don't be discouraged if I don't make it back.
Farewell,
Soldier
The correct answer to this open question is the following.
The three ways in that Oklahoma’s centennial was celebrated were through ceremonies, parades, and fireworks.
It was a big moment in the history of the state of Oklahoma. So the occasion invited to big celebrations in the entire state.
The state government, with the support of private companies, organized many activities to celebrate the important date. There were concerts, parades, and dedication of projects in different locations. For instance, there were restorations of old buildings, historic sites, the creation of new monuments, and a brand new dome for the capitol in Oklahoma City. Some people questioned these improvements because they were expensive: approximately 30 million. Money that could have been used to other priorities and necessities.
these ideas were Liberty, Equality, and Fraternity. It would be better if there was more context.