A land that had once run largely north-south<span> now ran east-</span>west. ... These changes mutually fueled the Second Industrial Revolution<span> which peaked ... River Valley, wheat in the </span>Midwest<span>, and manufactured goods in upstate New York.</span>
<span>The challenges they faced were deadly diseases called malaria and the yellow fever. The way the builders overcame them were because a doctor named Dr. William.</span>
Answer:
I believe the answer is William Howard Taft
5 ways the president deals with foreign policy