Articles of confederation I think.
Granville Woods improved the telegraph so the telegraph could transmit speech.
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Judicial review is basically the power of the courts to look at what the legislative, executive, and administrative parts do and then they determine if the acts were okay with the laws of the Constitution, or if they were against the constitutional, or unconstitutional.
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Horseback was still the fastest way over short distances on roads, but there was a well-established railway network in much of Europe and the United States. Steamboats were the fastest way to cross the water.