After a 1927 demonstration of which new technology did the April 8 New York Times say "commercial use in doubt"?

After a breakdown around 1919, which Russian-born ballet dancer spent the rest of his life in and out of asylums? After a close and bitter contest, which Illinois Democrat lost her Senate seat in 1998? After a decades-long fight to reclaim her throne, which former queen died November 11, 1917, in Honolulu? After losing his 1835 bid for re-election to Congress from Tennessee, which frontiersman moved to Texas? After a fatwa was issued against him in February 1989, which author went into hiding under police protection? After a German blitzkrieg, which country's King Leopold III surrendered on May 28, 1940? After a large French army was wiped out by yellow fever on which island in 1802, Napoleon decided to sell Louisiana? In a famous 1964 speech, Malcolm X said the choice facing America was "the ___ or the bullet". What word completes it?