How did Locke's philosophy have an impact on the "Declaration of Independence" by Thomas Jefferson.

John Locke's philosophy led quite directly to the words
that Jefferson put in the Declaration of
Independence.

Locke was a social contract theorist.  He
argued that people created governments by making a contract with one another.  In this
contract, the people agreed to give up some of their smaller rights so that the
government would protect their larger rights.  He argued that the people do this to keep
their larger rights from being taken forcibly by others.

To
Locke, people had three fundamental major rights.   These were the rights to their life,
their liberty, and their property.  He argued that people should consent to be governed
by a government so that the government could protect these rights.  This idea is
reproduced almost word for word in the Declaration of Independence when it lists our
"inalienable rights" and it says that governments are created to secure those
rights.