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How did the marriage of Philip and Joan connect the Habsburgs to Spain's American colonies?

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Stone ruins of Habsburg Castle, also known as Habichtsburg, stand on a hill above green vineyards in Aargau canton, Switzerland, with a flag flying atop the tower. — House of Habsburg Ruins of the castle of Habsburg, or Habichtsburg (“Hawk's Castle”), built 1020, the original seat of the house of Habsburg, Aargau canton, Switzerland.

The marriage of Philip I of Habsburg to Joan of Castile in 1496 was the foundational event that brought the Habsburg dynasty to the Spanish throne, thereby connecting the family to Spain's vast overseas territories, including its American colonies.1

Joan was the daughter of Isabella I of Castile and Ferdinand II of Aragon, who had sponsored the voyages that established Spain's presence in the Americas. Upon the death of Isabella in 1504, Joan inherited the crown of Castile. Following the death of Philip in 1506 and Ferdinand in 1516, their son, Charles I of Spain (also known as the Holy Roman emperor Charles V), ascended to the throne. This succession firmly established the Habsburgs as the ruling house of Spain and its colonial empire for nearly two centuries.1