The principle of Yin and Yang is that all things exist as inseparable and contradictory opposites, for example, female-male, dark-light and old-young. The principle, dating from the 3rd century BCE or even earlier, is a fundamental concept in Chinese philosophy and culture in general.
Had to look for the missing details and here is my answer.
The area that is generally considered by Ronald Reagan as the most positive legacy is the COLD WAR. The Cold War actually happened right after the World War II. What occurred during this time was that there was a tension between the powers of the West and the East. Ronald Reagan actually served as the 40th President of the United States and he was active during this event. Hope this helps.
You seem to be giving a statement more than asking a question, but the period you describe ran from about 1815 to 1825, and is most closely associated with the presidency of James Monroe.
The phrase "Era of Good Feelings" was coined by a journalist, Benjamin Russell, in the Boston newspaper, <em>Columbian Centinel</em>, on July 12, 1817. Russell used that term to describe the new era taking shape, especially as Monroe's presidency began, after Monroe visited Boston as part of a goodwill tour of the US. President Monroe certainly went along with the description and was trying to evoke that "good feelings" sort of mood in the country. Historians see "The Era of Good Feelilngs" as having begun around 1815, after the War of 1812 and the end of Napoleon's wars in Europe, when the United States entered an era when it could focus on its own affairs and not need to be concerned about political and military happenings in Europe. The "Era of Good Feelings" is strongly associated with Monroe's two-term presidency, from 1817 to 1825. President Monroe made goodwill tours of the country in 1817 and 1819 to promote national pride and national unity.
Napoleon was famous for his excellent military tactics and battle strategies
