Place where the first of the Civil War were fired.

Fort Sumter, Charleston, South Carolina

Explanation:

Early on the morning of April 12, 1861, Confederate guns around the harbor opened fire on Fort Sumter. With the firing on Fort Sumter, the American Civil War was officially upon both the North and the South.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.