One reason the United States went to war against Spain was that: a. the leaders of the Democratic party pushed for war. b. Cuban cigar manufacturers in Florida insisted that war was necessary to protect their markets. c. there was strong support among the American people for going to war. d. the shipping profiteers in New England believed their prosperity depended on war. e. Theodore Roosevelt insisted his corollary to the Monroe Doctrine demanded war.

c.there was strong support among the American people for going to war.

Explanation:

One reason the United States went to war against Spain was that there was strong support among the American people for going to war.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.