During the offset of the invasion of North Koreans to the South during the Korean war there are a lot of concerns whether to aid the South or avoid the conflict. One of this is whether the USSR would join the war if the United Nations Allied Forces would aid South Korea and whether the war would escalate from a small region conflict into another world war that would lead to a nuclear war between two superpowers - the US and the USSR.
The difference between slavery and its more modern variety was manumission – the ability of slaves to be freed. However, the law gave any children born to freedmen, after formal manumission, full rights of citizenship, including the right to hold office. Informal manumission gave fewer rights.
Britain and russia and i think french but not sure bout that one
the gulf of tonkin resolution was repealed in 1970 because it gave too much power to the president.