The purposes to move to the United States were religious prosecution, the Great Potato Famine and starvation, no jobs in their original country, no freedom, and they were going from war. The immigrants had to go through a medical test once they got done being checked for disease,mental problems, and other things but they would get chalk marks with letters telling about their problem.
X - high up at the frontside of right shoulder - mental defects.
X - further down on the right shoulder - disease or deformity.
X - within a circle - some definite disease.
B - back problems
G - struma
H - hart problems
Pg - pregnancy
Ct - eye disease