Answer:
Biological warfare.
Explanation:
Mongol Empire used biological warfare method (black plague) to kill humans in the Crimean peninsula. Mongol troops threw plague victims into the city, thus contaminating the inhabitants. The Mongols were the first to use germ warfare. The Mongol army threw infected bodies into the attacked Crimean city of Caffa, and that led some of the survivors to flee and spread epidemic from Caffa to the Mediterranean Basin.
It was Jimmy Carter who failed to get many of his initiatives passed because he was a political outsider unfamiliar with the ways Congress works. Hope its the right answer
