<P> The most serious attempt at secession was advanced in the years 1860 and 1861 as eleven southern States each declared secession from the United States , and joined together to form the Confederate States of America . This movement collapsed in 1865 with the defeat of Confederate forces by Union armies in the American Civil War . </P>
<P> The most serious attempt at secession was advanced in the years 1860 and 1861 as eleven southern States each declared secession from the United States , and joined together to form the Confederate States of America . This movement collapsed in 1865 with the defeat of Confederate forces by Union armies in the American Civil War . </P>
when did the south seceed from the union
when did the south seceed from the union
1860 and 1861
1860 and 1861