A problem that is caused by a disease or treatment of a disease and may continue for months or years.
Hopefully it will help
After the Vietnam War ended, immigration by Vietnamese refugees skyrocketed. Also, American soldiers began bringing home Laotian brides from the country of Laos, called Hmong. This is why the United States has a large Hmong population in the Midwest.
Geographic means physicals features of the land in this case you look at only the negatives of this like big bodies of water mountains and steep terrain these made it difficult because some settlers didn't have horses or were traveling in large groups wich could contain elderly and young children
The answer is C) They enable campaigns to sample public opinion.
