Throughout the 16th century, Spain explored the southwest from Mexico. The first expedition was the Niza expedition in 1538. Francisco Coronado followed with a larger expedition in 1539, throughout modern New Mexico and Arizona, arriving in New Mexico in 1540. The Spanish moved north from Mexico, settling villages in the upper valley of the Rio Grande, including much of the western half of the present-day state of New Mexico. The capital of Santa Fe was settled in 1610 and remains one of the oldest continually inhabited settlements in the United States.