Era
20th century
3,390
Civil War, 1861-1865
1,984
1945-
1,874
Revolution, 1775-1783
1,781
1939-1945
1,629
21st century
1,547
1900-1999
1,380
War of 1812
1,270
Cretaceous
1,165
1971-1981
1,161
1991-
1,123
1981-
968
2001-2009
931
19th century
916
2009-
886
1981-2001
866
1946-
831
1989-
773
1939 - 1945
716
1960-
668
Tertiary
661
2000-2099
642
1971-
636
1993-
584
Quaternary
582
1980-
544
1979-
539
1980
532
2001-
507
2010
497
Since 1991
493
1951-
488
1945-1989
477
1981-1993
477
Paleozoic
460
1948-
453
2000
452
1959-
448
1990
444
1952-
440
Since 2009
436
1961-1975
435
From 65 to 140 million years ago
421
1993-2001
413
1949-
405
Since 1945
402
Cenozoic
396
World War, 1939-1945
380
1991
366
2001
364
more ...