In June 1987, Reagan challenged Soviet leader Mikhail Gorbachev to "tear down" the Berlin wall. two years later, the wall came down, then the enslaved nations of the Soviet empire gradually broke free, and the Soviet union collapsed.
The correct answer is letter A and D.
Explanation: The Great Immigration occurred mainly from the South to the North, which is the most developed in the region. The process was strained as a result of growing social as well as economic inequalities, which increasingly generates labor shortages and sufficient resources for all.
They move because of the poor economic conditions, and the racial segregation in states that has the Jim Crow laws working, in the Southern states.
One of Josephine Baker’s most famous professional tasks was tracking down Mary Mallon (“Typhoid Mary”) in 1907. The way Ms. Mallon’s case was handled raises some interesting questions even today about conflicts between personal rights and public health: George Soper at the Department of Health Laboratories had investigated seven family epidemics of typhoid going back to 1900. He found that they were all linked to the cook [Mary Mallon] in each family.
I hope this helps you:)
