I just got done with the exam the correct answer is C. Malaria
Yes. If there is no cause there is no effect.
Answer:
One of the most significant advancements in military technology during the Civil War was from inventor and engineer John Ericsson, who created the designs for a new type of naval vessel for the United States: the ironclad ship with revolving turret.
Explanation:
A cause was that Texas declared its independence from Mexico. It changed the U.S. by the U.S. gaining California, New Mexico, Utah, Arizona, Colorado and parts of Wyoming.
Maybe the one at the bottom