Comparative advantage. It is being able to produce goods by using fewer resources, at a lower opportunity cost, that gives countries a comparative advantage. The gradient of a PPF reflects the opportunity cost of production. Increasing the production of one good means that less of another can be produced.
Answer:
On this day in 1814, during the War of 1812 between the United States and England, British troops enter Washington, D.C. and burn the White House in retaliation for the American attack on the city of York in Ontario, Canada, in June 1812.
Hope this picture with a fact helps you.