Mending the World
To understand how the concept of tikkun olam arose, we have to travel back in time to one of the turning-points in Jewish history: the Spanish expulsion and its aftermath.
Tikkun Olam, Israel and a Just World Order

Several months before he was elected president, Barack Obama invoked the term “tikkun olam” (literally, repairing the world) in order to create a common bond with his American Jewish audience.
Tikkun Olam: A Case of Semantic Displacement
The term “tikkun olam” has become the shibboleth of American Jewry, and like other Jewish words such as “chutzpah” it has entered English vocabulary without translation.