How many years did slavery last in the united states

246 years

Explanation:

As far as the institution of chattel slavery ; the treatment of slaves as property ; in the United States, if we use 1619 as the beginning and the 1865 Thirteenth Amendment as its end then it lasted 246 years, not 400.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b

sitting in that one chair where he could get shot at was his worst decision.