This is the 4978th most frequent Japanese word.
築
"築" means "to build" or "construct."
築かれました is the verb 'to be constructed' indicating that the object was built.
この学校は、1950年に築かれました。
This school was built in 1950.
築いた in this context refers metaphorically to achieving or 'building' success.
努力を重ねて成功を築いた。
Through consistent effort, success was achieved.
築山 refers to an artificial mound, applying the concept of construction or accumulation to landscape.