René-Robert Cavelier, Sieur de La Salle, a French explorer, received assurances and support from France for his explorations in North America during the late 17th century. King Louis XIV of France provided La Salle with ships, supplies, and funds to claim territories in North America, particularly in the Mississippi River region. La Salle aimed to establish French colonies and trading posts in these areas. Additionally, he sought support from Native American tribes, some of whom allied with him during his explorations.