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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.
The Confederates besieged Chattanooga in early fall 1863, but were driven off by Grant in November. Many of the Confederate defeats can be attributed to the poor strategic vision of General Braxton Bragg, who led the Army of Tennessee from Perryville, Kentucky to Confederate defeat at Chattanooga.
Tennessee...it use to be a confederate state but later joined the union
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).
Because the Union victory opened the way to the control of the Tennessee River, which, together Fort Donelson on the Cumberland River represented the gateways for the invasion of Tennessee State.