What technologies necessitated the use of trench warfare

Technology used in ww1

Airplanes, products of the new technology, were primarily made of canvas, wood, and wire. At first they were used only to observe enemy troops. As their effectiveness became apparent, both sides shot planes down with artillery from the ground and with rifles, pistols, and machine guns from other planes.

Explanation:

where is the map at?

because it took place after the war of 1812 had come to an end.