Why is 1492 used as the year of discovery? history midterm?

During what century did muhammad recieve his first revelation from god

What was one cause of the decembrist revolt? a. the desire for a constitutional monarchy b. the need for workers’ reforms c. the creation of a new railway line d. the outcome of the crimean war

Which document did the second continental congress send king george iii to refaffirm colonist allegiance to him but not to parliament