Why was imaginary line drawn which ran north to south through America?

You're likely referring to the Prime Meridian, which is a line of longitude, not an imaginary line drawn specifically for America.

Here's why the Prime Meridian is important:

* Defining Longitude: Longitude lines run north to south, measuring a location's distance east or west of the Prime Meridian. This allows us to pinpoint locations precisely on a globe.

* Global Reference Point: The Prime Meridian serves as a zero-degree reference point for longitude. It was chosen to pass through the Royal Observatory in Greenwich, England, in 1884 by international agreement.

* Time Zones: The Prime Meridian is also crucial for determining time zones, as the Earth rotates eastward. Every 15 degrees of longitude represents an hour difference.

The Prime Meridian doesn't have anything specifically to do with America. While it runs through the Atlantic Ocean, crossing parts of Africa, Europe, and the North Pole, it doesn't pass through the United States.

There are other lines of longitude that run through America, each representing a specific degree of longitude. However, none of these lines have the same global significance as the Prime Meridian.