Answer:

lusitania

Answer	Crossword Clue
LUSITANIA	Subject of the 2015 Erik Larson nonfiction bestseller "Dead Wake"
LUSITANIA	Portugal, to the Romans
LUSITANIA	Ship in the news in 1915

LUSITANIA	May 7, 1915.
LUSITANIA	Headline of May 7, 1915.
LUSITANIA	Headline of 1915.
LUSITANIA	U-boat victim, May 7, 1915.
LUSITANIA	Ill-fated liner, 1915.
LUSITANIA	Ill-fated ship of W.W. I
LUSITANIA	Famed Atlantic victim
LUSITANIA	Victim of 1915

LUSITANIA	Liner sunk on May 7, 1915
LUSITANIA	Its destruction marked a turning point in World War I
LUSITANIA	Ship named for an ancient Roman province in Iberia