There were 30 states at the beginning of 1850 and 31 at the end. <span>At the start: </span> <span>15 free states- Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Ohio, Michigan, Indiana, Illinois, Iowa, and Wisconsin </span>
<span>15 slave states- Delaware Maryland, Virginia, North Carolina, South Carolina, Georgia, Florida, Kentucky, Tennessee, Mississippi, Missouri, Arkansas, Texas, Louisiana, and Alabama </span>
<span>Then, with the Compromise of 1850, California came into the Union as a free state.</span>
North America was the closest comparison. The mongol empire covered 9.15 million square miles of land while North America covers 9.54 million square miles of land.
The U.S. had built a naval base in Hawaii at Pearl Harbor. Hawaii's importance as a military outpost became critical when Japan attacked Pearl Harbor on December 7, 1941. This brought the United States as well as Hawaii into World War II.
