Why are political parties an important example of unwritten constitution?

Having three different political parties allows the voters to have three very different choices which is an unwritten part of the constitution but is what the constitution wanted when it was written. Each party has very different views on how our country should be run and this allows the people to make a choice and then the electoral college helps to make a decision in the case of he presidential election. Otherwise in an election it is done by majority rules where each voters vote is equal to the next persons vote.

The correct answer to this open question is the following.

Although there are no options attached we can say the following.

In addition to mapping the Louisiana purchase, Louis and Clark also contributed to Americans' knowledge about the west part of the North American territory and its possibility to be settled.

After the Louisiana Purchase of 1803, US President Thomas Jefferson ordered the Lewis and Clark expedition to explore the newly acquired lands. The task was for Meriwether Lewis who, in 1804 accepted the help of William Clark to lead the exploration of the unknown territories.

After two years and almost 9000 miles of the journey, both explorers returned to Washington D.C: to debrief the president.