By what means did the kings of France unite the country in the 11th century? Why didn’t it work before?

When feudalism strengthened in the 11th century, barons and counts ceased to be considered leaders of tribes and districts, they lost a lively connection with the majority of the people. The king did not lose the consecrated “connection with his fellow tribesmen, confirmed by the church’s anointing. Therefore, the king could play off the feudal lords among themselves and with the townspeople in a legal way, being the supreme judge of the country.