Your answer here would be the emancipation proclamation Announced by Abraham lincoln
President Abraham Lincoln<span> issued the Emancipation Proclamation on January 1, 1863, as the nation approached its third year of bloody civil war. The proclamation declared "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free." </span>
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Answer:
Explanation:
Around 1830, producing 100 bushels of wheat required 250 to 300 hours of labor. By 1890, the labor required had decreased to between 40 and 50 hours. Wheat production efficiency improved five to eight times in this period.
In 1850, it took 75 to 90 hours of labor to produce 100 bushels of corn. By 1890, the same amount of corn required only 35 to 40 hours of labor. The amount of corn produced per hour of labor approximately doubled between 1850 and 1890.
Production improvements are linked to innovations such as the use of chemical fertilizers, threshing and mowing machines, and better plows and harrows.
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<u><em>-Jazz</em></u>
However, determining the precise beginning and ending to any "period" is often arbitrary, since it has changed over time over the course of history.
Answer: Because they had never developed immunities to the disease
