1 Nephi 10:11

11  And it came to pass after my father had spoken these words he spake unto my brethren concerning the gospel which should be preached among the Jews, and also concerning the ^adwindling of the Jews in ^bunbelief.  And after they had ^cslain the Messiah, who should come, and after he had been slain he should ^drise from the dead, and should make himself ^emanifest, by the Holy Ghost, unto the Gentiles.

            -Christ went to the people/the keepers of the covenant first.  These were represented by the Jews and other remenants of the house of Israel.  When these largely rejected him and refused to give him his rightful place, he went to the Gentiles –those outside the covenant group.  He extended the covenant to them and made them his covenant people.