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:
I believe it's <span>B) abolition
</span>
Lines of latitude, also called parallels, "<span>a. run in an east and west direction and measure distance north and south of the equator", while lines of longitude run North and South. </span>
Before jobs were all on fields or working for shipping yards, after there were jobs in mills and factories and high demand for them.
