I'd say the combustion engine, even though it was toyed with in the mid-west during the cowboy era, it wasn't until after the Civil War in which it was a fully effective gasoline powered engine.
C is your Answer:
Workers tried to get improved conditions and wages through labor unions. These unions often started friendly enough, but they soon became organizations for winning improvements by collective bargaining and strikes.
<span>Industrial workers also tried political action. The struggle to win the right to vote and to extend their political power was one of the major factors in the spread of democracy during the 19th century.</span>
Answer:
Horace enacted an educational reform, thus creating the ability that every child could have a basic education funded by taxes from locals.
