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The important contribution to navigation made by Eratosthenes in the third-century bc was a reasonably accurate calculation of the circumference of our planet.
Who is Eratosthenes?
Eratosthenes was born in 276 BC and died in 194 BC. He was a well-known poet, mathematician, a researcher in geography, and theorist of music. He was the first to gauge the size of the planet.
The Earth was first measured by Eratosthenes of Cyrene. The precise measurement of Earth's circumference was greatly aided by Eratosthenes' work in the third-century bc.
As a result, the Eratosthenes in the third century bc accurate calculation of the Earth.
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The rebuilding of the South after the Civil War is called the Reconstruction. The Reconstruction lasted from 1865 to 1877. The purpose of the Reconstruction was to help the South become a part of the Union again.
President Lincoln's original goal in the Civil War was to hold the nation together. and in this, the war and Reconstruction were a success. The Confederacy was destroyed for good, and every state that had seceded was readmitted to the Union.
All of the Southern states drafted new constitutions and ratified the Reconstruction Amendments. Many African Americans participated in new state and local governments, which worked for equal rights and to rebuild or create services like schools, railroads, hospitals, housing, roads and asylums. The direction and policies adopted by president Abraham Lincoln were on the good track to unify the country.
Answer:
It proclaimed the freedom of slaves in the ten Confederate states still in rebellion. It also decreed that freed slaves could be enlisted in the Union Army, thereby increasing the Union's available manpower.
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