Fleet. He ventures up to the Temple Terrace area in search of longleaf pine to use as masts for his ships. He names the pine forest of the area "El Pinal de la Cruz de Santa Teresa" or "The Pines of the Cross of Saint Teresa". There is a plaque commemorating his exploration at Riverhills Park in Temple Terrace. (1772) A map drawn and sent to the Earl of Hillsborough, English Governor of West Florida, shows the river named as the Hillsborough. During the mid and late 18th century, Native Americans from the north, mostly Creek, begin to migrate to Florida. These immigrants become known as Seminoles. (1821) Florida becomes a United States territory. (1824) Construction of Fort Brooke begins at the mouth of the Hillsborough River. (1828) The Fort King Military Road (now State Road 41) is built to connect Fort King in Ocala with Fort Brooke in what was then the settlement of Tampa. A bridge is built to cross the Hillsborough. (1830) Congress passes the Indian Removal Act. The American government begins efforts to remove the Seminole from Tampa Bay and relocate them to a reservation west of the Mississippi. Tensions between Seminole and Americans continue. (1835) Seminoles burn the bridge at the Fort King Road's river crossing. Conflict continues. (1836) Fort Foster is established at the Hillsborough River crossing to protect this strategically advantageous position. (1842) The Armed Occupation Act promises one hundred of land to any man who can bear arms, build a house and cultivate for five years. (1843) The Jean Street Shipyard is founded on the Hillsborough River in what will be the neighborhood of Seminole Heights. (1846) The first ferry crossing on the Hillsborough River is established. This improves transportation and widens the growth of Tampa to both sides of the river. (1861) During the American Civil War, Tampa Bay is blockaded by federal troops to prevent goods from leaving Tampa or from coming into Tampa. (1863) Federal troops march upriver to a location near the present day site of Lowry Park Zoo. There they discover a blockade-running steamer and sloop loaded with cotton. The ships are burned. The skirmish that follows is the only Civil War action on the Hillsborough River. (1891) The Tampa Bay Hotel, now the Henry B. Plant Museum, opens with a grand ball. (1897) At a cost of $150,000 an electrical dam is built on the river