Final answer:
Alexander Hamilton was the 1st Secretary of the Treasury in George Washington's cabinet who helped get the young nation out of debt.
Step-by-step explanation:
The 1st Secretary of the Treasury in George Washington's cabinet who helped get the young nation out of debt was Alexander Hamilton. Hamilton was appointed by Washington and played a key role in addressing the nation's financial problems, including war-related debts. His reports on public credit, a national bank, and manufacturing became a blueprint for future economic growth and a strong central government.