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
They were first mentioned by the political philosopher John Locke. He was very influential for the founding fathers who based the ideas of rights that are self evident on his philosophy. According to him, the natural rights were those of life, liberty, and property, a bit different than what ended in the final documents.
Which war? Please explain in more detail?