How effective was the 15th amendment in the late 1800s to early 1900s

After the Civil War, during the period known as Reconstruction (1865–77), the amendment was successful in encouraging African Americans to vote. ... Many African Americans were even elected to public office during the 1880s in the states that formerly had constituted the Confederate States of America.

Explanation:

i would say b. research typically uses a variety of sources

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.