4 era una fuente de materias primas un mercado para los productos industriales de las potencias y una reserva de población para incrementar sus ejercicios en una época en que se reducieron las guerras locales

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.

napoleon the third became a empire in 1873 also known as the era of the franco-prussian war.