How does the following statement in the Declaration of Independence support the conclusion that America must form its own government?

Prudence, indeed, will dictate that governments long
established should not be changed for light and transient
causes; and accordingly all experience hath shown that
mankind are more disposed to suffer, while evils are
sufferable, than to right themselves by abolishing the
forms to which they are accustomed. But when a long train
of abuses and usurpations, pursuing invariably the same
object evinces (reveals a design to reduce them under
absolute despotism, it is their right, it is their duty, to throw
off such government, and to provide new guards for their
future security