Theresa May on Leading in the Spirit of a 'One Nation Government'

The speaker announces their acceptance to form a new government, following in the footsteps of David Cameron. Cameron's leadership is praised for economic stabilization and social justice achievements, including same-sex marriage and tax reforms. The speaker aims to lead with a similar spirit of inclusivity and justice.

What significant social change was introduced during David Cameron's leadership?

What is the speaker's intention regarding leadership as mentioned in the text?