 Complete the following phrase:  A succession of colonial Spanish governors had their official residences built on what today is the plaza and, in 1713, the land was sold to the British South Sea Company. The South Sea Company operated their slave trade out of the former governors residence and a fort and bullring were later built nearby. The land was the site of Gen. John Whitelockes 1807 defeat upon Britains second attempt to conquer Buenos Aires, whereby the area became known as the Field of Glory. The 