What plant was introduced by the indigenous population that has a high negative impact on lives today?

"The term non-native refers to plants that have been introduced from other regions or countries. ... Other non-native species such as cheatgrass (Bromus tectorum L.) have become severe weeds that often out-compete native grasses and forbs. Under some conditions, some non-native species have become invasive."

Explanation:

answer; ///i do believe that the correct answer is ; /// (d)/return to polytheistic

answer; /// i do believe but not sure(nazi propaganda)//(anti-semitism); ( holocaust) plz check first; ///good luck