The Twenty fifth amendment created a specific order of presidential succession
This amendment allows the vice president to become president if the president dies, resigns, or is removed from office
Mother Teresa's marital status was single. This is because she was a sister (nun) and nun's are not allowed to get married, as they are essentially supposed to devote their lives to the church. Mother Teresa was a Roman Catholic religious sister and missionary who spent most of her life in India where she ran a number of charitable institutions.
What did they help with? Can you elaborate further
Union soldiers were fighting for the freedom of slaves and reuniting the states. Confederate soldiers fought for protecting the confederacy. Yes, it did change over the war.