The passage of the thirteenth, fourteenth, and fifteenth amendments brought the country closer to fulfilling the founding principle of

The correct answer is equality.

This is due to the fact that the 13th, 14th, and 15th amendments gave more political rights to newly freed African Americans.

The 13th amendment gets rid of the institution of slavery within the United States.

The 14th amendment states that anyone born on US soil is automatically a US citizen, giving millions of former slaves citizenship.

Lastly, the 15th amendment gives African American men the right to vote in elections. All of these were intended to fulfill America's promise of equality for all citizens.

they wanted the u.s. to fight on the side of the central powers.