What was king davids most important achievement?

David while a young boy and had God's blessing so that he was not afraid to come up against the Opposition, namely the Giant Goliath which he killed. That was his most important achievement.

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

The executive branch is more responsible for interpreting laws !