Vietnamization was a policy of the Richard Nixon administration to end U.S. involvement in the Vietnam War through a program to expand, equip, and train South Vietnamese forces and assign to them an ever-increasing combat role, at the same time steadily reducing the number of U.S. combat troops.
B. If you look at the dates, the earliest instance of the plague started in the south. Then, it continues to spread upwards and to the west, and the dates continue chronologically, from 1347 to 1349.
The British abandoned Boston in early 1776 because they were forced out of the country by the American soldiers.
American Revolutionary War was at large, and the Patriots, led by general Washington (who later became the first president of USA) won the battle at Boston, which was bloodless, by the way. This brought an end to an eight-year British occupation of the city.