There were 40 years between 1861 and 1901.
1861
Unification17 March 1861 - Republic2 June 1946
This question appears to be about the US Civil War which took place from 1861 to 1865.
12
Monaco was granted sovereignty in 1861.
There were 40 years between 1861 and 1901.
1861
Monaco was granted sovereignty in 1861.
Italy was made as a country in 1861.
The Northern states had a population nearly two and a half times that of the South.
Unification17 March 1861 - Republic2 June 1946
April 12, 1861
an aircraft
The American Civil War (1861-1865)
17 March 1861
42 years