How do modern methods help historians investigate the Black Death?

I hope this helps some

Explanation:

Modern methods allow the testing of victims' bodies using new technology As a result some groups were blamed and persecuted.

An error that was corrected with new evidence.

i think its toxic gasses but i could be wrong

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.