Neptune discovery telescope. The telescope at New Berlin Observatory (1835â1913), that discovered Neptune, was an achromatic refractor of 9 Paris inch (9.6 English inches or 24.4 cm) aperture made by the late Joseph Fraunhofer's firm, Merz und Mahler.
The southern states needed these slaves because the southern states had more farms and plantations than the North did. Not everyone could afford slaves; slaves were really expensive. They were expensive to buy because they had to be feed and taken care of.
Introduction. Slavery in America began when the first African slaves were brought to the North American colony of Jamestown, Virginia, in 1619, to aid in the production of such lucrative crops as tobacco.fter the American Revolution (1775-83), many colonists (particularly in the North, where slavery was relatively unimportant to the economy) began to link the oppression of black slaves to their own oppression by the British, and to call for slaveryâs abolition.