Passage: A trust was founded in 1920 to build a memorial at the site after a resolution was passed by the Indian National Congress. In 1923, the trust purchased land for the project. A memorial, designed by American architect Benjamin Polk, was built on the site and inaugurated by President of India Rajendra Prasad on 13 April 1961, in the presence of Jawaharlal Nehru and other leaders. A flame was later added to the site.

Question: in waht year was the trust founded to buld a memorial
1920