1910s: Around 100,000 of Dublin's workers stage a large strike in response to the Great Dublin Lock-Out of 1913. The strike ends after much violence.

Early 1940s: Two thousand Dublin municipal workers strike in 1940. The strike is ended through negotiations, and the Trade Union Act of 1941 is passed to try to set ground rules for future labor disputes and to avoid expensive strikes.

Today: Ireland has the fastest growing economy in Western Europe and is held as a worldwide model for dramatically improved social conditions. Dublin is at the center of it all, with a high level of education and job prospects that have attracted a large immigrant population.

1910s: Religious tensions between Catholics and Protestants in Ireland mean that life is very uneasy for many.

Early 1940s: Religious tensions between Irish Catholics and Protestants, particularly in Northern Ireland, mean that life is very uneasy for...