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13 of Britain's north american colonies rejected its imperial rule. -
congress voted to declare independence, 2 days later, it ratified the text of the Declaration. -
The framers of the Constitution separated the powers of government into three branches, legislative(pass laws), executive (administer laws), and judicial ( interpret and enforce the laws). -
The United States purchased 828,000 square miles of land west of the Mississippi River for $15 million. -
The American Civil War was fought between 1861 and 1865 over the issues of slavery and states' rights. -
Booth had been part of a conspiracy to kidnap Lincoln, that he thought it was grounds for killing Lincoln. -
it was invented because,through his work with the deaf and his careful study of how sound is transmitted via the human voice -
the desire to compete with what he considered less efficient sources of lighting and energy. -
Wilbur and Orville Wright spent four years of research and development to create the first successful powered airplane -
Factories were shut down, farms and homes were lost to foreclosure, mills and mines were abandoned, and people went hungry. -
Adolf Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany -
the day of any important invasion or military operation. -
the Japanese city of Hiroshima was devastated by the first atomic bomb to be used as a weapon of war -
Japan intended the attack as a preventive action. Its aim was to prevent the United States Pacific Fleet from interfering with its planned military actions in Southeast Asia