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disasters × 25united-states × 4
20th-century × 3
japan × 3
transportation × 3
nautical × 3
world-war-two × 2
age-of-sail × 2
nuclear-weapons × 2
titanic × 2
military × 1
russia × 1
france × 1
naval × 1
language × 1
slavery × 1
government × 1
monarchy × 1
roman-republic × 1
aircraft × 1
sources × 1
ships × 1
election × 1
geography × 1
disease × 1