a surge of smuggling, bribery, and intimidation of customs officials. Colonial wars fought in America were also a source of considerable tension. For example, New England colonial forces captured the fortress of Louisbourg in Acadia during King George's War in 1745, but the British government then ceded it back to France in 1748 in exchange for Chennai, which the British had lost in 1746. New England colonists resented their losses of lives, as well as the effort and expenditure involved in subduing the fortress, only to have it returned to their erstwhile enemy, who would remain a threat to them after the war. Some writers begin their histories of the American Revolution with the British coalition victory in the Seven Years' War in 1763, viewing the French and Indian War as though it were the American theater of the Seven Years' War. Lawrence Henry Gipson writes: The Royal Proclamation of 1763 redrew boundaries of the lands west of newly-British Quebec and west of a line running along the crest of the Allegheny Mountains, making them indigenous territory and barred to colonial settlement for two years. The colonists protested, and the boundary line was adjusted in a series of treaties with indigenous tribes. In 1768, the Iroquois agreed to the Treaty of Fort Stanwix, and the Cherokee agreed to the Treaty of Hard Labour followed in 1770 by the Treaty of Lochaber. The treaties opened most of what is present-day Kentucky and West Virginia to colonial settlement. The new map was drawn up at the Treaty of Fort Stanwix in 1768, which moved the line much farther to the west, from the green line to the red line on the map at right. 1764–1766: Taxes imposed and withdrawn In 1764 Parliament passed the Sugar Act, decreasing the existing customs duties on sugar and molasses but providing stricter measures of enforcement and collection. That same year, Prime Minister George Grenville proposed direct taxes on the colonies to raise revenue, but he delayed action to see whether the colonies would propose some way to raise the revenue themselves. Grenville had asserted in 1762 that the whole revenue of the custom houses in America amounted to one or two thousand pounds sterling a year, and that the English exchequer was paying between seven and eight thousand pounds a year to collect. Adam Smith wrote in The Wealth of Nations that Parliament "has never hitherto