The role of the president "to lead the country" is very important.
Without a leader, we would be divided, and "united we stand, divided we fall"
its a simple as that, without a leader, we would be a lot more divided than we are now and without the president, well, there might be chaos
hope this helps
President Jefferson authorized Robert Livingston and James Monroe to purchase all the Louisiana Territory This agreement was known as the Louisiana Purchase. The purchase itself included land from fifteen present day states including portions of Arkansas, Missouri, Iowa, Oklahoma, Kansas and Nebraska, South Dakota, Montana, Wyoming, Colorado.
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The local leader who commanded most Samurai armies was known as a Shogun, and was the official military leader under a Shogunate when Japan was united and no longer several warring clans.
The U.S. not only joined the UN but they followed a new policy away from Isolationism and were now protectors of the world rather than separated from it
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National labor relations board to learn about all of that stuff