Answer:
World War I popularized the use of the machine gun—capable of bringing down row after row of soldiers from a distance on the battlefield. This weapon, along with barbed wire and mines, made movement across open land both difficult and dangerous. so trench warfare was born
Explanation:
The answer is approximately 130,222,815 people they make up approximately 1.73% of the worlds population. Hope this helps.
Cleaning and making sure it has no knots in it
