They felt endangered because they knew that the government would try to abolish slavery.
The XYZ affair led to a period of anti-French sentiment in the United States, which was problematic as the French has been the key ally during the American revolution some 20 years before and was one of the primary reasons the United States was able to defeat Great Britain.
However, over those 20 years, France had undergone a revolution of their own and the United States decided to remain neutral in France's war against Great Britain.
<span>Latent political judgment is the proper term. Political judgement is a judgement based on rational thought and it requires weighing the pros and cons of a decision. When the judgement is latent, it means the judgement must be made quickly due to the circumstances surrounding it.</span>
The Chinese decided to enter the Korean War on November 25-26, 1950. This was an enormous shock to the American forces, as well as to the United Nations. The United States, and in particular U.S. Gen. Douglas MacArthur, believed that the Chinese would not openly enter the war. When China did provide support to North Korea, the effect was catastrophic on the American forces, leading to a great expansion of the conflict.
The simple answer here is because of slavery.