The bacterial life began to mix- the Colombian exchange- and new diseases were introduced <span>to American populations that had no prior experience of them. The results were devastating. These populations also were introduced to new weeds and pests, livestock, and pets. New food and fiber crops were introduced to Eurasia and Africa</span>
Hiya,
the answer your looking for would be "McCarthyism".
Answer:
A member of Congress introduces a bill into his or her legislative chamber. The president may sign the act of Congress into law, or he may veto it. Congress can then override the president's veto by a two-thirds vote of both the House and Senate thereby making the vetoed act a law.
Explanation:
