The first organized opposition to slavery as an institution emerged in the late century. a. fifteenth b. sixteenth c. eighteenth d. twentieth

Your answer is the 18th century, the Civil War ended in 1865. So, the first organized opposition to slavery as an institution must have been in the mid 1800's

the protestant reformation's started in 1517, disturbing the religious and political order in europe´s catholic countries. the outcome was the european wars of religion prosecuted in europe in the 16th, 17th and part of the 18th century. nonetheless, uprisings, territorial disputes, and great power conflicts were also causes of the wars.  

b, the anti immigrant fervor