Japan Formed a secret weapon development group back in 1946 after world war two. In 2020 America began development on the Mech Project. Both of these top secret projects enter their final stages of development in the year 2053, The year is 2054. Japan and America both discover their highly dangerous projects. the president is assassinated and America declares war on Japan. Hence the "War Of The New Age" and some even speculate World War 3. (Some inspiration of Titanfall 2)