Map shows when the states ratified<span> the </span>19th amendment<span> to the U.S. Constitution giving women the right to vote. The </span>approval<span> of thirty-six </span>states<span> was</span>needed to ratify<span> the </span>amendment<span>; Tennessee became the thirty-sixth on August 18, </span>1920<span>, fourteen months after Congress </span>had passed<span> it.</span>
The period saw major technological advances, including the adoption of gunpowder, the invention of vertical windmills, spectacles, mechanical clocks, and greatly improved water mills, building techniques (Gothic architecture, medieval castles), and agriculture in general (three-field crop rotation)
The Suez Canal, i<span>s an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea and the Red Sea.
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