Technically WW1, but they switched sides.
The 2 sides of WW1 was the same as the ones of WW2 : Allies v.s Axis powers
All sides in WW1 used artillery.
All sides already possessed them before the war.
The two examples of direct control in ww1 included price controls and rent controls.
ww1 and 2
WW1 and WW2
kuifkuil
WW1 started in 1913 and continued till 1918. It had two sides: The Triple Alliance which consisted of Germany, Austria-Hungry (Which was one country) and Italy. Also there was The Triple Entente which was Britain, France and Russia.
A trapezoid with two congruent, opposite sides is an isosceles trapezoid.
The Allied Powers - England, France, USA (after 1917), Russia, (until 1917), Italy (after 1915), and other countries. The Central Powers - Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria.
Mauser and Springfiled are two.