YOU SAID:

When in the Course of human events it becomes necessary for one people to dissolve the political bands which have connected them with another and to assume among the powers of the earth.

INTO JAPANESE

人間の行為の過程で、ある人が他の人とつながっている政治的なバンドを解体し、地球の権力の中で引き継ぐことが必要になったとき。