The Black Plague came to Europe . along the Silk Road
by ship
by infected birds
from South America

Explanation:

The plague arrived in Europe in October 1347, when 12 ships from the Black Sea docked at the Sicilian port of Messina. People gathered on the docks were met with a horrifying surprise: Most sailors aboard the ships were dead, and those still alive were gravely ill and covered in black boils that oozed blood and pus.

c-three

explanation:

legislative, executive and judicial

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )