What was the most technological change during the market revolution?

Americans integrated the technologies of the Industrial Revolution into a new commercial economy. Steam power, the technology that moved steamboats and railroads, fueled the rise of American industry by powering mills and sparking new national transportation networks. A “market revolution” remade the nation.

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when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.