How did the Lost Order #191 help the Union?
It guaranteed them a victory over the South at Antietam
It forced the Confederates to unify their armies at Sharpsburg.
O McClellan knew what the Confederates were going to do ahead of time.
It showed that Lee had a lot more troops than McClellan first thought.

The correct answer is McClellan knew what the Confederates were going to do ahead of time.

Explanation: General Robert E. Lee issued an order # 191, which somehow got lost, right before the Battle of Antietam. The order was found by Union forces of the 27th Indiana troops on the Best Farm in Maryland. Lee, not knowing the order was lost, continued with the plan. McClellan having the lost plan in his hands, used it to defeat Lee,

- "the civil rights movements"

- "following the american civil war and abolition of slavery, the united states entered a period known as reconstruction, during which black americans continued to suffer from disenfranchisement, racial segregation, and economic oppression. beginning in the early 1950's, black americans launched a series of major campaigns of civil resistance, emphasizing the need for nonviolent protests and civil disobedience."

"such as the montgomery bus boycott of 1955-56, a campaign launched by rosa parks against the policy of racial segregation of the public transit system in alabama. “sit-ins” became popular across the american south, particularly in greensboro, north carolina, increase national sentiment."

- "the counterculture movement"

- "counterculture began to develop in the united states following the rise of conformity in american culture during the 1950s. by 1963, youth, particularly those of the white middle class, began rejecting the cultural standards and normality of their parents, opting for progressive attitudes instead. the movement gained momentum as the civil rights movement became increasingly successful and as the u.s. military intervention of vietnam began to take a negative turn."

"hippie counterculture moved further into popular culture following the summer of love in 1967 when thousands of people came together in the haight-ashbury neighborhood of san francisco. along with greenwich village in new york city, haight-ashbury became a hub for the counterculture movement."

ayatollah khomeini can best be described as the leader who declared iran to be an islamic republic.