Input: Article: Boston was an early port of the Atlantic triangular slave trade in the New England colonies, but was soon overtaken by Salem, Massachusetts and Newport, Rhode Island. Eventually Boston became a center of the abolitionist movement. The city reacted strongly to the Fugitive Slave Law of 1850, contributing to President Franklin Pierce's attempt to make an example of Boston after the Anthony Burns Fugitive Slave Case.

Now answer this question: What movement did Boston become the center of after it stopped slave trade?

Output: the abolitionist movement

Input: Article: In the Battle of Cowan's Ford, Cornwallis met resistance along the banks of the Catawba River at Cowan's Ford on February 1, 1781, in an attempt to engage General Morgan's forces during a tactical withdrawal. Morgan had moved to the northern part of the state to combine with General Greene's newly recruited forces. Generals Greene and Cornwallis finally met at the Battle of Guilford Courthouse in present-day Greensboro on March 15, 1781. Although the British troops held the field at the end of the battle, their casualties at the hands of the numerically superior Continental Army were crippling. Following this "Pyrrhic victory", Cornwallis chose to move to the Virginia coastline to get reinforcements, and to allow the Royal Navy to protect his battered army. This decision would result in Cornwallis' eventual defeat at Yorktown, Virginia, later in 1781. The Patriots' victory there guaranteed American independence.

Now answer this question: After losing the battle of Guilford Courthouse, Cornawallis moved his troops where?

Output: Virginia coastline

Input: Article: It was only in the 1980s that digital telephony transmission networks became possible, such as with ISDN networks, assuring a minimum bit rate (usually 128 kilobits/s) for compressed video and audio transmission. During this time, there was also research into other forms of digital video and audio communication. Many of these technologies, such as the Media space, are not as widely used today as videoconferencing but were still an important area of research. The first dedicated systems started to appear in the market as ISDN networks were expanding throughout the world. One of the first commercial videoconferencing systems sold to companies came from PictureTel Corp., which had an Initial Public Offering in November, 1984.

Now answer this question: In what decade was digital telephony transmission made possible?

Output:
the 1980s