20th century 9
Cession to the United States, 1819 5
Paleozoic 5
Quaternary 5
Tertiary 5
To 1821 5
Huguenot colony, 1562-1565 4
Pliocene 4
Spanish colony, 1565-1763 4
approximately 1500-1542 4
18th century 3
1946- 3
21st century 3
Colonial period, ca. 1600-1775 3
Miocene 3
To 1803 3
1767-1845 2
1896-1953 2
1948- 2
1951- 2
19th century 2
2000 2
Civil War, 1861-1865 2
Cretaceous 2
Devonian 2
Holocene 2
Neogene 2
Silurian 2
Spanish colony, 1784-1821 2
To 1565 2
1510-1554 1
1519-1574 1
1533?-1588 1
1585-1590 1
1739-1812 1
1751-1836 1
1767-1848 1
1821-1865 1
1829-1909 1
1857-1910 1
1870-1938 1
1871-1938 1
1882-1945 1
1907-1990 1
1908-1993 1
1913-2004 1
1922-1987 1
1929 1
1935-2020 1
1942-2016 1
1957- 1
1959-1990 1
2017-2021 1
2019 1
Cenozoic 1
Cession to United States, 1819 1
Eocene 1
Mesozoic 1
Oligocene 1
Pleistocene 1
Spanish exploration to 1565 1
To 1763 (New France) 1
To 1810 1
War of 1812 1
approximately 1700- 1