How did the bubonic plague reach europe?

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.

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.