I think it was the Age of Discovery. After the Crusades and the fall of Feudalism,
the growth of towns and commerce attracted interest in other lands that began
during the Crusades when they were exposed the silks and spices being traded
there. This prompted European powers to
embark on journeys to establish trade routes as well as find new lands to
colonize.
This impacted Chinese and irish immigrants with the need for laborers for the railroad system. many needed jobs to support their families.
Basically it's a key to candidates because it is considered to influence the overall result of the president election. Democratic and Republicans both have a good chance to gain a win.
C because I said so why question it
