Because there were messages intercepted from Germany to Mexico, telling Mexico to join the war and attack the United States. I hope this helps :)
Answer: The entry of the United States was the turning point of the war, because it made the eventual defeat of Germany possible. It had been foreseen in 1916 that if the United States went to war, the Allies' military effort against Germany would be upheld by U.S. supplies and by enormous extensions of credit.
Explanation:
I believe the answer is;
C) Specialize in specific forms of labor
<span>The dawn of agriculture made people to move around anywhere when they were following animals for food. Because of constant relocation, simple shelters were constructed and occupied by different individuals of all genders and ages. Sometimes, you end waking up with someone unknown beside you.</span>
