How did Gálvez prove his trustworthiness to the Americans?

Gálvez proved his trustworthiness to the Americans through his consistent support in the fight against British forces during the American Revolution. He provided significant military assistance, including troops, supplies, and financial aid, which bolstered the American cause. His strategic actions, such as leading successful campaigns in the Gulf Coast region, demonstrated his commitment to the American struggle for independence and solidified the alliance between Spain and the American colonies.