Question: 美国内战是什么时候开始和结束的
Answer: 1861-04-12; 04-12-1861; 1861 4月 12; 12-04-1861; 04/12/1861; 12/04/1861; 04 12 1861; 1861 04 12; 12 4月 1861; 1861-04-12; 12 04 1861; 1861 april, 12; 1865-04-09; 04/09/1865; 1865 04 09; 09 04 1865; 09-04-1865; 09 4月 1865; 04 09 1865; 04-09-1865; 1865 4月 09; 1865 april, 09; 09/04/1865; 1865-04-09