The thing which was a major factor that threatened the major unity in the United States in the mid-19th century was:
<h3>The Great Depression</h3>
This refers to the period around 1929 in the United States which has a profound effect on the national economy.
This led to the failure of many banks, increase in unemployment and high deflation rates which all threatened the national unity.
Read more about Great Depression here:
brainly.com/question/441267
I'm pretty sure the answer is D. poor working conditions, because people back then were very serious when it came to working, since they needed the money badly. All of the other answer choices are factors that led to the Great Depression.
At the time of the attempted siege he only had one hundred soldiers
