What presidential son served as Secretary of War under Chester Arthur?

Chester Arthur is credited with transforming what branch of the military to one of the best in the world?

Chester Arthur passed the first major civil service reform bill in American history that made political tests for office illegal and required written exams for several positions. What was the name of this bill?

Chester Arthur was an abolitionist and considered one of the founding fathers of what anti-slavery party of Abraham Lincoln?

Chester Arthur was elevated from VP to President following whose death?