Whose assassination started a serious rift between muslims in the seventh century c. e.

Othman’s assasination had caused a major rift between the Sunnis and Shia.His successor, who was also known as the fourth caliphate, Ali, who was another son-in law of Muhammad cause the sectarian fraction between the Shias and Sunnis. During his reign, Ali was constantly at war with neighboring Muslim states

your answer is 1930's

explanation

this is just around the time the great depression was starting and putting the us ecnomy into ecnomic failure causing the goverment to take a much larger rule to try and pieace it back together