In 1868, Alabama, Arkansas, Florida, Georgia, Louisiana, North Carolina and South Carolina were readmitted to the Union. Georgia, however, promptly forced all the black Americans out of their state legislature, which forced the U.S. Government to reinstate martial law. It was once again admitted back into the Union in 1870 along with the final former Confederate states of Texas, Virginia and Mississippi.
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It depends on what you consider secession. North Carolina was the last state who's legislature approved an ordinance of secession (May 20, 1861). However, both Tennessee and Virginia submitted their articles of secession to the voters for approval, and these ratifications occurred later. Virginia voters approved secession on May 23, 1861, while Tennessee voters approved secession on June 8, 1861. So while Tennessee was the last state to "officially" secede, North Carolina was the last state to practically secede (as the voter ratifications were basically just a formality at that point).
To keep the union intact, in other words keep USA undivided
US Civil War 1861-1865.
The civil war ended in 1865. That is the best answer it can get for the year it ended.
The Commander of the Northern armies during the last year of the Civil War was Karla Montas.