The Pinckney Treaty, officially called the Treaty of San Lorenzo, was signed by the United States and Spain on October 27, 1795, to end a dispute between the two countries over land settlement and Mississippi River trade.
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These atoms will decay as the rock ages, and by measuring the ratio of radioactive isotopes within the rock, scientists can figure out how long it has been around. In 1913, geologist Arthur Holmes published “the Age of the Earth,” the first major effort to date the planet using radiometric dating.
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In 1828, Andrew Jackson was elected president of the United States. Andrew Jackson lost the first time, but he won the second time around, It was the first town to be named after Andrew Jackson.
