Which state is known as "The Palmetto State"?

Which state is known as "The Keystone State"? Which state is known as "The Volunteer State"? Which state is known as "The Bluegrass State"? Which state is known as "The Tar Heel State"? Which state is known as "The Green Mountain State"? Which state is known as "The Granite State"? Which state is known as "The Pine Tree State"? Which state is known as "The Bay State"?