I believe the answer is: They worried about having to take part in future wars.
At that time, the united states senates prefer to take the position as a neutral force that want to avoid any intervention toward other countries' problems. This stand is taken away the moment the Japanese army decided to initiate an attack to the pearl harbour.
The complex naval event in the Gulf of Tonkin, off the coast of Vietnam, that was presented to the U.S. Congress on August 5, 1964, as two unprovoked attacks by North Vietnamese torpedo boats on the destroyers Maddox and Turner Joy of the U.S. Seventh Fleet and that led to the Gulf of Tonkin
Answer: The Treaty of New Echota
Explanation: Negotiated in 1835 by a minority party of Cherokees, challenged by the majority of the Cherokee people and their elected government, the Treaty of New Echota was used by the United States to justify the forced removal of the Cherokees from their homelands along what became known as the Trail of Tears
The vast majority of those who were enslaved and transported in the transatlantic slave trade were people from central and western Africa, who had been sold by other West Africans to Western European slave traders (with a small number being captured directly by the slave traders in coastal raids)
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