Era
20th century
3,382
Civil War, 1861-1865
1,983
1945-
1,873
Revolution, 1775-1783
1,781
1939-1945
1,626
21st century
1,541
1900-1999
1,370
War of 1812
1,270
Cretaceous
1,165
1971-1981
1,161
1991-
1,121
1981-
967
2001-2009
931
19th century
912
2009-
886
1981-2001
865
1946-
831
1989-
772
1939 - 1945
716
1960-
668
Tertiary
661
2000-2099
641
1971-
636
1993-
584
Quaternary
582
1980-
544
1979-
539
2001-
507
2010
496
Since 1991
489
1951-
487
1981-1993
477
1945-1989
476
Paleozoic
460
1948-
453
2000
451
1959-
448
1990
442
1952-
440
Since 2009
436
1961-1975
434
From 65 to 140 million years ago
421
1993-2001
413
1949-
405
Since 1945
401
Cenozoic
396
World War, 1939-1945
380
1991
365
2001
364
1914-1918
355
more ...