The main reason for the interest of France and the japan in order to control over the Indo and china was the availability of the resources in the country as the period of the 20th century was marked as the period of the large scale growth in terms of the trade and commerce and this lead to the economic diversity of the nation as form 1930 the France started to exploit this region for the tea, rice, the coffee, the pepper, the coal, and the zinc.
The line that runs north-south is called the prime meridian. The Prime Meridian separates the earth in and East hemisphere and a West hemisphere, much like the equator does for the north and south hemispheres.