Final answer:
The colonists show their commitment to the Declaration by declaring themselves as Free and Independent States, with the power to perform the duties of an independent nation.
Step-by-step explanation:
In the final section of the Declaration of Independence, the colonists show their commitment by declaring themselves as Free and Independent States, absolved from all allegiance to the British Crown.
They state that they have the power to levy War, conclude Peace, establish Commerce, and do all other acts and things which Independent States may of right do.
Furthermore, they pledge their Lives, Fortunes, and sacred Honor to support this Declaration.