The assassination of President Garfield in 1881 changed government policy because it helped to lead to --
the passage of the Chinese Exclusion Act.
to stricter protection of the president and creation of the Secret Service.
an end of the spoils system and the creation of civil service reform.
the passage of the Dawes Act.

an end of the spoils system and the creation of civil service reform.

Explanation:

President James A. Garfield was assassinated on 19 September 1881 by a dissatisfied job seeker and this assassination was instrumental in Congress passing the Pendleton Civil Service Reform Act on 16th January 1883.

This Act states that the government should hire workers based on merit and the selections should be made based on merit. It also prohibited workers to be sacked or demoted because of political reasons.

rain drop drop top my name is nick harris and this is my pawn shop