56. what is the significance of the yin yang symbol?

Well it means balance if thats what you mean by significance

Yin and yang can be thought of as complementary (rather than opposing) forces that interact to form a dynamic system in which the whole is greater than the assembled parts. Everything has both yin and yang aspects, (for instance shadow cannot exist without light).

Between 1801 and 1803, President Jefferson negotiated the purchase of Louisiana from the French government, led by Napoleon Bonaparte.

The Louisiana Purchase Treaty is signed on April 30, 1803 in Paris. However since the limits of the acquisition had not been specified, it was only after the Adams-Onis Treaty of 1819 that the border was defined.

B is the correct answer.