Everyone. Everyone had them before the war even began.
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Yes, machine guns were used in WW2.
Used extensively.
The Germans used a variety of machine guns on D-Day, including the MG 34 and MG 42. The MG 34 was a versatile weapon used by the German army, while the MG 42 was known for its high rate of fire. Both machine guns were used by German forces during the invasion of Normandy.
Machine guns and barbed wire were not new technology during WW I. The atomic bomb would not exist for another 30 years. (Poison gas was invented during WW I, and first used by French forces.)
Large scale jet-on-jet combat, helicopters, improved rifles and machine guns.