UnScramble this Word: i d o l g l a z?

Questions

In 1864, who was massacred at sand creek detention camp in colorado?

In 1891, film was introduced to replace ______ in making photographic negatives?

In 1902, which volcano erupted killing 30,000 people?

In 1918, what illness caused 20 million deaths?

In 1924, pope urban viii threatened to excommunicate people who used what?