UnScramble this Word: e e s d v i p r?

Questions

History - George Washington Carver advocated planting what to replace cotton and tobacco?

History - Germany was split into two zones by which agreement?

History - His wife was Roxana, his horse was Bacephalus, he was?

History - How many British officers were forced by Indian troops into the Black Hole of Calcutta?

History - How many people were killed in the battle of Lexington?