Why did Franklin Delano Roosevelt have 4 different vice presidents?

Can you get alimony if social security the only income? Who is the current Chief Justice of the Supreme Court of the State of Nevada? Who Ended the practice of nominating presidential candidates by party caucuses in Congress? What is the importance of labor welfare? Can you stay at any Navy base if you are in the Navy? What is outstanding capital? Why did the dentist decide to join the army? What is the difference between Homeland Security and Emergency Management? How will the government shutdown affect veterans affairs? What are the 2 branches of congress? Where is the Great Seal on a US 1 dollar bill? What is a dd form 2701 used for? Where could one find help to consolidate student loan debt? How many sarahs are there in the world? What does Laura bush look like when she was little? How do you spell poverty? What historical thing happened on the east coast in 1847? What carries out the laws with the money congress provides? Who faced the greatest discrimination on the west coast in the late 1890s? Can you add your wife to your existing Medicare insurance if she is unemployed?

Why did Franklin Delano Roosevelt have 4 different vice presidents?