12
Roky mountains
Territories
There were 40 years between 1861 and 1901.
This question appears to be about the US Civil War which took place from 1861 to 1865.
To decide if the conquered territories would become free or slave states. This ultimately led to the American Civil War (1861-1865)
between 1801 and 1861
Roky mountains
Mississippi river
Territories
There were 40 years between 1861 and 1901.
They feared the new acquired territories would undermine the delicate balance between slave and non-slave states. They tried to ban slavery on the new territories by introducing the Wilmot Proviso (1846). However, many of these territories were already pro-slavery, including New Mexico and Texas. This unresolved issue was one of the main reasons of the American Civil War (1861-1865).
Former Mexican territories were supposed to ban slavery, except Texas. This was defined ion the Wilmot Proviso (1846). However, it was not enforced, and caused further divisions between pro-slavery states and the North. It resulted in the American Civil War (1861-1865).
popular sovereignty
They feared the new acquired territories would undermine the delicate balance between slave and non-slave states. They tried to ban slavery on the new territories by introducing the Wilmot Proviso (1846). However, many of these territories were already pro-slavery, including New Mexico and Texas. This unresolved issue was one of the main reasons of the American Civil War (1861-1865).
Dred Scott v. Sanford
Winfield Scott. He got his nickname because of his insistence in appearance and discipline in U.S. army. Served (1801 - 1861)
an aircraft