Answer:
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed.
You eat something you neither plant nor plow. It is the son of water, but if water touches it, it dies.
Who is that with a neck and no head, two arms and no hands? What is it?
What never gets any wetter no matter how hard it rains?