The mystery surrounding Nikitin's journey was whether he changed faith to Islam
Explanation:
From the story attached, Nikitin, who was a christian Russian merchant went on a journey from Russia to Persia and then to India. This journey was recorded (in writing) by he himself in a book called <em>Voyage Beyond Three Seas.</em> <u>One subject of controversy or uncertainty was whether he changed his faith or not during the course of his journey as he practiced/observed several Islamic pillars of faith (like fasting during the month of ramadan) which in itself doesn't make him a Muslim as argued by some scholars but could also meant he changed faith as argued by others</u>.
He died on his way back home and perhaps made it difficult to ascertain his faith during the course of the journey.
Vicksburg effects: The Battle of Vicksburg effected the Civil War because the Union got full control of the Mississippi river therefore taking over and shutting down the confederates trade, transportation, and military/fortifications.
